mouse wateningoffer

We'd like to send you a free sample ofour new unique, 500 cc plastic wateringbottle. You'll find it virtually unbreakable.It's clear, rigid, has a wide 17/8" openingfor easy cleaning. And it's auto-clavable.Made of lightweight polycarbonate,

our new watering bottle will eliminatebreakage. Designed for use in the lab,our bottle has no crevices or ridges toharbor bacteria or to invite gnawing byanimals. Size is 7" x 27/8" x 23/8". A fullline of stoppers and stainless steelsipper tubes is available.

It's from Lab Products, a new companyof people experienced in lab animal care.You can get your free bottle sample andquantity prices by making a letterheadrequest to Lab Products, Inc., 635Midland Avenue, Garfield, N.J. 07026.Phone: (201) 478-2535

lab productsInc

Circle No. 76 on Readers' Service Card

agricultural crops is negligible. We arecurrently studying rural groups 12 milesnorth of Aligarh which illustrate theseprinciples. These groups maintain out-standingly good productivity with verylittle cost or damage to villagers. Underproper rural management, rhesus mon-keys provide a source of income andcultural interest for local people, and atthe same time a valuable biological re-source is fostered. We hope the ideasof Bermant and Chandrasekhar findwide distribution and favorable con-sideration.

CHARILES H. SOUTHW1CK4-A Orienit Rowv,Calcuitta 17, Inidia

Intourist: A Pleasant Experience

Romer's letter (23 Apr., p. 326),complaining about his experiences withIntourist in the U.S.S.R. should be con-

sidered in relation to general conditionsin that country and to the conditionsencountered by any tourist not speak-ing the native language. I spent Mayand June 1970 in the U.S.S.R. on theexchange program of the U.S.S.R. andU.S. national academies of science.After traveling once to Norosibirsk on

my own, I was thereafter most pleasedto have the -help of Intourist. Thanksto this organization, the foreign touristbenefits from a special waiting room atairports with uncrowded meal facilities,on domestic airlines he can board theplane (one class, with no reservations)before the Russian travelers and thuscan select the preferred seats and staywith his friends, and finally, he doesnot have to stand in line for eitherreservations or baggage registration.Thanks to the representative of Intour-ist in the Moscow hotel of the U.S.S.RAcademy of Sciences where I was stay-ing, I was provided, on short notice,with tickets for the opera or the balletat the Bolshoi Theater, for concerts,and so forth. These events could notbe attended without the help of Intour-ist because of the great demand fortickets.

Considering the still-limited touristaccommodations in the U.S.S.R. andthe existing bureaucratic procedures, Ifound that Intourist was most helpful inrelieving the foreign tourist of the nu-

merous difficulties found when travel-ing alone. Is Romer aware of the vex-

ations of the non-English speaking for-eign tourist who, on arrival in theUnited States, attempts to book a flight

or a hotel room, or reserve a seat atthe Metropolitan Opera? It is evendifficult for him to call home, sincethe New York operators handling theinternational lines to Europe do notspeak or understand the foreign lan-guage involved.

ROGER W. JEANLOZMassach usetts Generail Hospital,Boston, Ma.ss(ichltsetts 02114

I have twice visited the U.S.S.R.,once as a tourist in 1958, and againas a representative of the U.S. govern-ment to the 9th International Confer-ence of Wildlife Biologists in 1969.For that conference Intourist arrangedfive tours and handled groups of 30 to75 biologists flawlessly.

I personally took two tours, one nearMoscow, another to eastern Siberia witha group. In 20 years of traveling aroundthe world, I have never seen groupsbetter handled. For example, after wevisited l ake Baikal, Intourist informedus that the next day we would be flownto Brask to tour its massive hydroelec-trical development. We, being biolo-gists, objected and indicated that wewould much prefer to spend time inprimitive woodland habitats (the taiga).After some discussion, Intourist agreed,flew us to Brask, bussed us to the taiga,turned us loose there for half a day,fed us, and then gave us a quick tourof the hydroelectrical development. Wewere all flown back to Irkutsk, and thetour returned to Moscow while mvwife and I took the Trans-Siberian rail-road to the east coast. Accidentally, oneof our bags was returned to Moscowwith the tour group. Four days laterat Khabarovsk our bag had been lo-caited, shipped across the U.S.S.R. byair, and returned to us.A curse-yes, if the meeting orga-

nizers have not communicated theirwishes effectively; a tremendous boonif mnatters have been properly arranged.

GARDINER BUMPU.S. Birseaui of Sport Fisheriesand(I Wildlife, Washingtoni, D.C. 20240

Nutrients in Lake Erie

Hubschman suggests (12 Feb., p. 536)that massive harvesting of unspecifiedorganisms from Lake Erie could removesufficient nutrients to improve the pol-luted condition of the lake. Quantitativeconsiderations indicate, however, thatthe amount of common nutrient ele-ment removed under such a program

SCIENCE, VOL. 172

FirstAid Kit.New Nalgene TJointSleeves of Teflon TFE.

First aid for frozen ground glassjoints! These ultra-thin, self-lubricating sleeves of pure Teflon.eliminate breakage without themess and contamination of stop-cock grease.

Unlike others available, NalgeneT sleeves cover the full lengthof the ground surface. They fit per-fectly and will withstand tem-peratures from -100° to +250°C.Excellent for vacuum systems.

Fifteen sizes from 7/25 to 60/50packed 6 per size in vinyl, walletsize containers that keep themclean, dry, and ready for reuse.(Cat. No. 6194). Just another waywe're trying to keep broken glassout of your laboratory.Order from your Lab Supply

Dealer. Ask for our Catalog orwrite Department 4106, NalgeneLabware Division, Rochester,New York 14602.

SYBRON GOFORlHATION

Nalgene Labware... the permanent replacements.

Circle No. 75 on Readers' Service Card

25 JUNE 1971

would be small compared to inputs andvery small compared to amounts al-ready accumulated in sediments or

solution.For example, input of phosphorus

into Lake Erie is estimated to be2.3 X 1010 g/year, with 24 percent fromrunoff and 76 percent from municipaland industrial wastes (1). Loss toLake Ontario is a small fraction of thisamount. Photosynthetic production ap-

proximates 1.7 X 1012 g of carbon per

year (I) and this productivity (66 g

of carbon per square meter per year)compares well with Ryther's estimateof 100 g of carbon per square meterper year for productive coastal areas

(2). An average mass ratio ofC:N:P=40:7:1 applies to phy-toplankton (3). Thus, primary produc-tion could sequester as much as

4.3 X 1010 g of phosphorus per year

or an amount about double input.It seems unlikely that more than a

few percent of this quantity could beharvested on a sustained basis. Har-vesting of phytoplankton is clearly im-practical, and harvesting of animalspecies would involve trophic levelsnear 2 at best. Commericial fishing now

removes only about 1.4 X 108 g ofphosphorus per year or about 0.6 per-

cent of input. This corresponds to an

average trophic level of about 3, if thecalculation is based on carbon and thecurrent catch of 4.5 x 109 g (dryweight) per year is assumed to repre-

sent the maximum sustainable yield(1). The harvest of lake organismsmight depress biological productivity,however, by removing the growth-limiting nutrient, provided the nutrientaccumulates only slowly in the lakeand is neither nitrogen nor phosphorus.We are unaware of data which clearlydetermine the growth-limiting nutrientfor Lake Erie.

It would seem more efficient in termsof energy and technology to interceptnutrient elements from cities and in-dustr'ies before they become part ofthe lake system.

STUART M. ROSENBLUMTHOMAS C. HOLLOCHER

Envirofl/lmental Stuidies Program,Bratndeis Univervsi,Walt/ltam, Ma ssaeht.sett.s 02154

References

1. Fcdetral Water Pollltien C onitrol Admriinistra-tion (Great Lakes Reeicn), Lake Erie Report,a Plait for W4ate, Pol.ution (Contol (U.S. De-partment of the Interiot-, Washingtcn, D.C.,1968).

2. J. Ryther, Science 166, 72 (1969).3. H. U. SvedroLp c ta'.. The (Ot -eois (Pt-enitice-

Hall, Ness Yo k, 1946).

GRANT SWINGER

CARRIES ON IN

THE COLUMNS OF

D. S. GREENBERG'S

Science & Govern mzenit Report

The authorativ e. concise twice-

monthly newvsletter that tells you

what Washington is doing about,

and to. science. $25.00 per year

($35.00 Overseas) .

Science & Governnlmetit Report

P. 0. Box 21123, WASH.. 1). C. 20009

('202) 232-2035

SCIENCE & GOVERNMENTREPORT

P. 0. BOX 21123. WAtSH., D. C. 20009

a Entlosed is S25 (s35 Overseas) fora 1-Yeear Subscription.

D Please Bill Me.

NAMIE_ -

ADD RESS

CITY

STATFE -IPls

1295

-

L i

This microscopewill take

1980 accessories.

Ar ri 1989 ac one too. We rakXepKORJIIQP[ eli 'lOLv1c0-K ,srieOsUK1[lKt' develeoir el Ple o C eseric for- it.K i tyr.. t ( T H-)I) t^)N t, kte Cp-i -C

tr9 -I nt tf ili I-t L I \1lI

Ii1C it flit Iitli,t ti',-T fitliii eItt. rlit 'r(t,! )'_)l t- - t 031 1 t i= f'! tXI Ifu tr3 ) ,0() t

t1ev' rsa itI tI )r \(ixr re-tsearch.hl -r[{F¾V'L N -i H OPI, Ni tzrigric

and is specially desirned so wlhen you aftachiLccessories like lairip hoLJsitrgs. Ilumnlrators011(1cari era eLqu ipr-let. thley become anl fKtf )/f)+it of tie rwi(--rscope-anld don'tKterv(i (JL{t ii every dir'Ct onl.

TtIiefi it VVft. ['Djp to 21>` tim-nescaV tiertlar,ifli(-t of rora wide-field

K U SI( .014t'1 f. (i f to ed( ejb arid the1(gL n :- 0)). ItI-V V tieUIan 0L¾s Letz

Lt L,tzR k, ite:

E. bL-)Itz, Inc ., Roc kleiil~-h . J. J ()->4,7

C',r. Ae '-.r'- A Co

Circle No. 7 on Reciciers' Service Ccird

SORVALL - The Modern Conservatives!

swingwith the

The SORVALL RC2-B Automatic Superspeed Refrigerated Centrifuge letsyou keep your research cool. Heavy-duty refrigeration holds rotor tempera-ture within ±1 °C. of desired setting. Patented Gyro-Action Direct Drivethe drive that has never been matched for smoothness- accepts eightangle and horizontal rotors. New zonal capability with the SZ-14 ReorientingDensity Gradient Rotor (1400 ml) broadens the RC2-B's applications rangeimmensely. The RC2-B is a proven performer - there are thousands of themin daily use. And you get a top speed of 20,000 RPM that can produce forces

to 49,500 x G- plus rapid acceleration to allspeeds. The RC2-B is automatic with all rotors.An elevated, fully instrumented control panel,and simplicity of operation, are added con-veniences. Keep your research cool.

Look at the RC2-B before you buyany refrigerated centrifuge in the

RC2-B range. Ivan Sorvall, Inc.Norwalk, Connecticut 06856.

SORALi!

Circle No. 6 on Readers' Service CordAsk for Bulletin SC-7MC-2B

scanningelectrophoresisapparatusFORELECTROFOCUSING

An ultraviolet absorbance monitorin the system intermittently scans

the gradient at variouswavelengthsto determine when ampholytes are

focused and provide a baseline ofampholyte absorbance. Scanningduring migration shows when the

sample is focused, and a final scan

provides a contin-uous profile of thefinished gradient as

it is being collected.The low volume

column conserves ex-

pensive ampholytes;internal streamlininggives superior reso-lution and recovery

of focused zones.

FORDENSITY GRADIENTELECTROPHORESIS

Easy loading andautomatic samplecollection simplify

the electro-phoretic

separationand purification

of small samples.Intermittentabsorbance

scanning providesa complete historyof peak separation

LL-_ and indicatescompletion

of migration.

For more infor-

mation on all ISCO

density gradient andgel electrophoresisapparatus, send forour general catalog.

INSTRUMENTATIONSPECIALTIES COMPANY

4700 SUPERIOR LINCOLN, NEBRASKA 68504PHONE (402) 434-0231 TELEX 48-6453

Circle No. 73 on Readers' Service Card

1964-1965, and to the tail end of amini-epidemic of thalidomide em-bryopathy in 1962. This is because, inadvance of these events, specific ru-brics for limb reduction deformitiesand cataract or eye malformations hadbeen included in the coding.

A. Gittelsohn (Johns Hopkins) dis-cussed the possible use of computer-ized hospital records for monitoringmalformations. Discharge abstracts arealready extensively computerized inmany hospitals (and in one entirestate) for the purpose of characterizingmedical care. The greatest limitationto efficient use of these data for sur-veillance is lack of patient identifiersuch as social security number (orname) with the abstract provided.Sensitivity to confidentiality currentlyprecludes this. It is thus difficult tomatch abstracted hospital summariesfor the same anonymous individual forwhom little identifying data is avail-able. However, the more demographicvariables that are specified the greaterthe likelihood of linking any two rec-ords. In one small state with about10,000 annual births, use of just sex,birth date, residence, and birth weightprovides a high degree of accuracy ofmatches. Inclusion of information de-rivable from hospital records increasedthe ascertainment of malformations250 percent over that from just birthcertificates alone. A main advantage ofrecord linkage is its low cost comparedto other methods of monitoring.

In Metropolitan Atlanta hospitalsare visited systematically, and defectsnoted in the charts or otherwise re-ported by nurses or physicians arerecorded. There have been three tem-poral clusters of defects since 1967,but investigation has not revealed anysuggestive environmental causes (J. W.Flynt, Center for Disease Control,Atlanta).The higher incidence of mental re-

tardation in children with minor birthdefects such as low-set ears or wide-set eyes strongly implies that mentaldeficiency in such affected individualshad its onset in prenatal life (D. W.Smith). The possibility of using grossminor defects in newborns as indirectmarkers of environmental insult is en-hanced by the fact that there is arelatively high frequency (10 to 15 per-cent) of defects in the newborn popu-lation. Significant trends could thus bedetected more easily than with the useof less frequent markers (E. B. Hook,Birth Defects Institute). The outstand-ing question with this approach is the

1364

unknown sensitivity of such defects toenvironmental insult.

In discussion of some problems inthe biochemical approach to monitor-ing mutations, it was pointed out thatalthough it is relatively easy to auto-mate screening for deficiencies of pro-tein associated with disease states, it isa much more formidable task to auto-mate monitoring of qualitative pro-tein changes (I. H. Scheinberg, AlbertEinstein College of Medicine). It wassuggested that zone electrophoresis ofcord blood is one of the more promis-ing methods of detecting fresh muta-tions in the human population. How-ever, the current electrophoretic tech-niques may detect only 10 percent ofallele variability, the rate of (electro-phoretically) detectable mutations fora protein coded by 1000 nucleotidesmay be 5 X 10-6 per protein per gen-eration, and the error rate for typingand other procedures is likely to be ata minimum 1 per 1000 or at least 100times greater than the mutation rate.Furthermore, the rate of nonpaternityin the United States is vastly higherthan the frequency of a new mutantat any particular locus. These apparentproblems could be overcome by limit-ing the investigation of the possibilityof new mutation to individuals withvariants with a collective gene fre-quency of less than .0005. In thisevent, an estimated 400,000 bloodsamples must be screened for 30 pro-teins to obtain enough variants to de-tect 60 mutants (the number requiredstatistically to document a change ofabout one-third above the backgroundrate). Automation of electrophoretictechniques is probably the only possi-ble approach to a task of this magni-tude (L. Weitkamp, University ofRochester).The high correlation of chromosome

breakage with mutation in lower or-ganisms as well as the increased rateof breakage in irradiated individualssuggests that these markers may begeneral signs of mutagenic environ-mental insult (A. Bloom, Universityof Michigan, and M. Cohen, StateUniversity of New York, Buffalo).However, the significance of breakagein vitro after addition of drugs to cellsin culture is harder to assess and maybe indirectly influenced by a host ofunknown culture conditions. The maindrawback to large-scale monitoring ofchromosomal breakage in human pop-ulations is the tedious task of examin-ing metaphase plates and scoringbreaks. Cohen was optimistic about the

SCIENCE, VOL. 172

prospects for successfUl automation inview of the current status of severalsystems for either scoring from photo-graphs of plates already picked out byhuman examiners, or else by automaticexamination of slides without previoushuman selection of metaphase plates.A histochemical method uLsing

2-deoxyglucose-6-phosphate as a sub-strate for detecting variants of glUcose-6-phosphate dehydrogenase in leuko-cytes was discussed as a possible means

of monitoring somatic cell mutations.The wild-type enzyme lacks this prop-

erty, but at least two known variaintsof the enzyme possess it. In peripheralblood of middle-aged people about one

per 1000 cells strongly express thevariant phenotype, in agreement witha hypothesized mutation rate of 10-7amino acid substitutions per cell gen-

eration and about 104 divisions of leu-kocyte stem cells duLring the middle-aged life-span. The heritable nature ofthe phenotype in white cells is yet tobe establislhed, however. This or sim-

ilar approaches for detecting individ-ual cell variants (if proven to be dueto somatic mutation) will permit as-

sessment of the mutational exposure of

an individual through his lifetime. as

well as fairly immediate evaluation ofmutagenic effect of acute expos'Ure toa suspect environmental factor (H. E.SLutton, University of Texas).

In closing, remarks, Hirschhorn feltthat too liltle attention had been de-voted to the problem of the confi-dentiality of information acquired dur-ing monitoring. He cited misLlse ofDutch genetic records by the Nazisduring World War II as an exampleof the problems which record gather-ing for research purposes can entail.In reply, others commented that reg-

istries obtained from vital records use

already collected data which have stat-utory protection and simply tabullatethem in a different way. Colectioni ofconfidential information from any partof the population (as is currently man-dated by law for censuses and incometax purposes, as wcll as for vital sta-tistics) entails a certain personal riskwhich is accepted by society becauseof the presumed social benefits of use

of this information.Several participants briefly consid-

ered the problems of identifying theresponsible environmental agent once

an observed increase in malformationor mutation rate is observed. Some feltthat appropriate epidemiological tech-niques were relatively well developedfor such investigation. In addition,25 JUNE 1971

SCALE UP

GEL FILTRATIONWITH THE PHARMACIA

SECTIONAL COLUMN KS 370USE ANY KIND OF GEL

The Pharmacia Sectional Column opens up com-pletely new possibilities for large scale chroma-tography. It offers a unique combination of highresolution and high output.ANALYTICAL QUALITY SEPARATIONS. Produc-

tion scale fractionation of proteins, enzymes,etc.are now possible.FOR ALL TYPES OF SEPHADEX® AND SEPHA-

ROSER. Now even the soft gels can be used in100 litre columns.HIGH OUTPUT AND VERSATILITY. The capacity

of the column is increased simply by adding moresections (section volume 16 litres). Fractions canbe removed between any of the sections whichcan be replaced without disturbing the productionsequence.HIGH FLOW RATES. Obtained on all gel types

even with a large number of sections in the column.STERILIZABLE. A sterilizable version is available.

For additional information, including the bookletPharmacia Sectional Column KS 370, the "Stack"write to:

Pharmacia Fine Chemicals Inc.800 Centennial AvenuePISCATAWAYNew Jersey 08854

Pharmacia

Fine ChemicalsPharmacia (Canada) Ltd. 110 Place Cremazie, Suite 412, Montreal 11, P. Q.

(Inquiries Outside U S.A. and Canada should be directed to PHARMACIA FINE CHEMICALS, Uppsala, Sweden.}Circle No. 32 on Readers' Service Card

1365

New toploading balanceis fas, accurate...yet RUGGED!New Torbal ET-lI toploader (I160g capacity, I mg

accuracy) makes accurate weighing easier andmore foolproof than ever before.

NEW EASE thanks to complete digital display Ewithout the use of optical projections or verniers to

read, no estimating.

NEW EASE because the one piece constructionof the exclusive Torsion weighing mechanism has

no knife edges to chip, wear or collect dust-hence

there's no loss in accuracy.NEW EASE-thanks to the electronio null

readout feature, the ET-1 is not affected bysensitivity changes-from temperature or humidityvariations or effects of foreign matter or wear.As long as you can see the null needle move for a1.0 mg weight change, then a difference of1.0 mg in weight-reading means 1.0 mg-today,tomorrow, next month, next year.

NEW EASE because the ET-l's Torsionmechanism is far lessaffected by vibration thanoptical balances. You can

use an ET-1 in conditionsother balances can't take.NEW EASE thanks to

out-of-level accuracy.-For minor changes in levelof the ET-1, zero pointdoes not change. WRITE FOR FREE BROCHURE

THE TORSION BALANCE COMPANY Clifton, New Jersey. Sales offices inChicago, Ill.; San Mateo, Cal.; Pittsburgh, Pa.; Montreal, Quebec; and Windsor, England. v

Balances manufactured in Waterford, Ireland and Clifton, New Jersey.Circle No. 70 on Readers' Service Card

tacit in many. discussions was the as-

sumption that accurate ascertainmentof incidence rates and characterizationof the populations at particular riskmight permit identification of environ-mental factors already contributing tothe background rates.

ERNEST B. HooKLaboratory of Human Ecology,Birth Defects Institute,New York State Departmentof Health, Albany 12208

Man and Environment:A National Biological Congress

A series of national biological meet-ings of a new style has been inaugu-rated in which biologists talk notmainly to fellow-specialists but to thosein other disciplines and to the public.The idea, conceived by WilliamMcElroy when he was president of theAmerican- Institute of Biological Sci-ences, is to bring biology to the public,somewhat as the AAAS meetings bringall of science to the public. Since thefirst of three projected meetings of thistype, held in Detroit last November,was such a success, plans were immedi-ately put in motion for the second,which is to be held 23-26 October inMiami Beach. The theme of the seriesis Man and Environment, and partici-pating biologists are expected to presentand discuss environmental biology andmany related topics before an audiencedrawn from a variety of disciplines, or

even laymen. Needless to say, this isnot an easy assignment, and no doubtsome of the meetings may becometransmuted into technical discussions;but the goal is there, and everyoneagrees that it is high time biologistsmet with those in other scientific fieldsand shared their plans and their secretswith them.At a time when taxpayers are becom-

ing skeptical about financial support ofscience, and indeed about support ofeducation (as every university officialknows), it is essential that the public bewell and carefully informed as to whatbiologists are doing and planning. It isequally important, -and even more

stimulating, for those of us who are

active in one area of biology to knowat least something about what our col-leagues are doing in other areas. To

this end the program for the congress

covers a wide sweep. It includes more

applied bioloey than the regular AIBSmeetings, since it reaches over into

SCIENCE, VOL. 172

Shamlon gets to the bottom of

your chromatography tank problemsThe bottom of a Shandon Model 500 PanglasChromatank® is different because it's absolutely flat.Press molding eliminates the mound found at thebottom of ordinary tanks, giving you an even distribu-tion of solvent throughout the tank and saving sol-vent, especially in ascending techniques.Press molding also gives the Panglas Chromatank

stronger corners and heavier walls. It's made entirely

of glass, without metal or plastic fittings, to eliminatesolvent contamination.The Model 500 is the largest tank of its kind, measuring 20"f x 8" x 22"

high, accommodating either sheets or strips for ascending or descendingchromatography. It will also accept 46 cm by 57 cm sheets making it idealfor two-way chromatography.

For more information, write for Bulletin L383, Shandon Scientific Company,Inc., 515 Broad Street, Sewickley, Pa. 15143 (Pittsburgh District).

P I TTS B U RG H * LO N DO N * F RA N K F U RT

Circle No. 71 on Readers' Service Card

MMMMIb-

I m 'k-

N"'144"t

I

aogricultI-re andh1or1ticUIltUre oll thle Onehandl and into medicine and puIblichealth on the other. The cooperation otthe Federation of American Societiesfor fl'Aperiment.al Biology is importantin the latter coninlection. FLurthermore.two of the sym posia arec outs iicde thefield of' biology altogether, one dealinglwv ith geophysics ('Ou,r mobile earth)and onie sith meteorology ( Weather111modificaItion; ecologica oppOrtUnitiesand environmental problemis'").Man and Funx\1il-Oillrelit beimg the

themie. environ mental biology is in theiorel ront. The 1 5 morning S\l lposiawill dlel with SLich broad topics as'Ecological engineering" (organized bvThomas Malone) or "R.adialtion itsconltlrol and fi'utul-e dangers' (organizedby Alexander Hollaeiider). Aniother 15or so at ternooni symposia wvill he pr-esentedl by the biological societies. oftenaIctin,g ill sllmll grouIps; a program onplAnt andI an`11ima1ll peStS aCtuKII iVn'VOlV eStouir societies at once. N1tu,rall\-V Sonileof the problemls ou Foi kida xvill have anairiring; parlt of a symposium on veAhermodification tCatureS itS app)lication toSoIth Florida.L, and a whole svi-mposiuLmlis to be devoted to the Evergladics. BuitVI1,i is inot nieglectcd,; symposia onl tilewortl protein toodl problem. newknlossedge Of autoim1munl1,llitv, pola)LLI-tion pi-oblems. and xw orld trends in epi-dlelmic discases wNill i up reccltde\velopments in foLur vcry promiillelitficcls.

Ouie of' the evenings will be devotedto a diiSCuISSiOnl of the role ofI biologistsin shaping national policy, in whichMcElrov clir-ector- of the NationalScience FoUndation, and several na-tional legislators will take part. Detailsof all the programs can be had fromthe AIRBS. 3900 Wisconisin Avenle, NW\Washington. D.C. 20014.The last day ol the conigriess will be

devoted to field trips. South Florida isa, biologicallN LinLulstual part of the couin-try and offers suIch sights as crocodilesand flamningos in their niative habitatsin the Everglades. The Fairchild Tropi-cal Garden and the Pl.ant IntrodUctionStation may be said to offer the botalni-cal opposite numilbers of these rarities.Other trips wilt inclUde the marine bio-logical Ilaboratories nearby aind on theKeys, and at Biminli in the Baharmnas.

L,astIvl an advantage of the time andplace chosen is that the hotel rates inMiami Beach in October will be at

This one-gallon laboratory "workhorse" has all thepower you will ever need for high-speed reduction ofsolids. You can grind, emulsify, disintegrate, homoge-nize, shred, blend, or mix in seconds! The container,cover, and blending assembly are stainless steel, easyto clean, and trouble free. An ingenious adapter letsyou use smaller containers on the one-gallon base.

Waring also makes one-quart models (some withtimers, some with 7-speed controls), explosion-proofmodels, and accessories from 12 ml Mini Containersto ice crusher attachments. All are ruggedly con-structed and warranted for one year of commercial tuse. Write for our new cat

laster wiith thiswariAs Laboratory BI Ador ©

talog.

wonderregistered the name!

their min'iuImILII.KENNETH V. THINIANsN

C(rown' College, Untilversitvy of(California, Sanita Cr 71Z 95060

25 JUNE 1971 Circle No. 30 on Readers' Service Card