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allowed to be performed without anaesthetics. Inthe past year the Research Defence Society has beendevoting increased attention to educating the publicin the medical and scientific progress resulting fromexperiments carried out under the Act of 1876. SirLeonard Rogers has been able to give many lecturesto large audiences at universities and medical col-leges, to local scientific and debating societies, and,on two occasions, to the boys of well-known publicschools. The information given was valuable in
helping the hearers to form a balanced opinion onthe vivisection controversy. There has also beenan increased demand for the society’s leaflets, lanternslides, and general information from health authoritiesand numerous individuals, for use in local debatesand lectures. Financially the society’s position hasslightly improved, thanks to a small legacy and toincreasing subscriptions. Continued efforts are beingmade to obtain new members, in view of the enormousfinancial resources of the opponents of experiment.
THE ROYAL SOCIETY CONVERSAZIONE
AT the annual conversaziones of the Royal Societyworkers in different branches of science entertainone another with a wide range of exhibits anddemonstrations. As a rule no contributions ofpurely medical interest are to be found : this is notto be regretted, since medical societies provide manyoccasions on which doctors show specimens, and theclinical investigator can always get entertainmentand often help from seeing technical " tricks " fromthe repertoire of his colleagues in other sciences, andeven if the more complex ones are beyond himenjoy those demonstrations that have a spectacularappeal. This year an exceptionally large number ofguests assembled on May 28th. Practical hygieneprovided two interesting collections of exhibits.That a brightly polished surface reflects heat welland absorbs it badly has been known for more thana century; the application of these facts to theprotection of workers in the tropics or in the furnacerooms of industrial workshops has been shown to bepracticable by covering the various materials usedin the manufacture of sun-helmets, masks, gloves, andclothing with a layer of metal foil. 1 The use of
similarly prepared materials in the construction ofhouses, factories, ambulances, and ships was illus-trated by scale models. Other models showed themethods used in the attempted arrest of transmittedvibrations and noise for the exclusion of such everydaysounds as those of footsteps, electrical motors, andtypewriters and for the elimination of traffic vibra-tions. Prof. H. H. Woollard’s serial microphoto-graphs of sensory endings in the human skin havebeen shown previously to medical audiences. Inassociation with a new aesthesiometer for testingsensibility of the skin to touch and a new tachisto-scope for experiments in visual perception and
recognition they provided a remarkable group ofexhibits. From the physicists came two attractivedemonstrations: a collection of beautifully phos-phorescent powders and an exhibition of thefluorescent effects excited by mercury vapour dis-
charges in certain mineral salts. The estimation ofoxygen in very small quantities of blood, the estima-tion of minute traces of carbon dioxide given offby living plants, and the micro-analysis of very smallvolumes of mixed gases provided examples of thegreatly increased sensitivity and accuracy of chemicallaboratory methods. Some common insects were
used for three of the biological exhibits. It was
1 See THE LANCET, 1934, i., 37.
shown that the fine hairs of the anal cercus of a cock-roach, clearly visible under the microscope, vibratedso rapidly on the approach of a bowed tuning-forkthat they became invisible. The frequency of theresponses set up by these hairs in their afferentnerves bears the same relation to the frequency ofstimulation as does that set up in the mammalian
auditory nerve by stimulation of the cochlea, so
that it is possible, with a suitable stimulus, to obtainresponses from tactile end-organs of a form that hashitherto been regarded as peculiar to the auditoryapparatus. The blood-sucking bug rhodnium moultsfive times during development, passing through fournewt and one adult stage. A very small gland inits head secretes both a moulting and an inhibitoryhormone : the former, given to a first-stage newt,turns it immediately into a minute adult; thelatter, given to a fourth-stage newt, causes it toturn into a giant nymph. The third biological con-tribution, one of more direct medical interest, isconcerned with the study of the climatic factorsinfluencing the multiplication of fleas. Mice, eachsown with a numbered population of fleas, are keptseparately for several weeks under standard con-
ditions of humidity, warmth, and air supply. Theconditions thus defined as inimical to the survivaland to the propagation of fleas are expected to haveimportant practical application in the control offlea-borne diseases such as plague.
CHILDREN UNDER SCHOOL AGE
ON May 29th the Minister of Health addressed acircular (No. 1550) to local authorities charged withchild welfare, expressing his anxiety about theattention given to the health of children betweenthe ages of eighteen months and five years. In thistransition period between infancy and school life,16 per cent. of the children suffer from some diseaseor defect which is only discovered on entering school.The Minister recalls the intentions of the circular(B. of E. No. 1444), issued last January, about theprovision of nursery schools and the admission of
young children to infants’ departments of elementaryschools ; he adds : " It is clear that whatever pro-vision is made on the lines there suggested, veryconsiderable numbers of children under the age offive will remain at home." It should, he states, bethe duty of the health visitor to see these childrenat regular intervals ; for, even in the few placeswhere there are pre-school (sometimes called toddlers’)clinics, their success must depend largely on regularvisiting at home by the health visitor. The circularpoints out how desirable it is for the same authority(then, of course, the school medical service) to beconcerned throughout with the health of the growingchild, and where there is divided authority theMinister suggests ways in which the drawbackscould, and should, be removed ; and finally he insiststhat no authority will get efficient work out of its
health-visiting staff unless it pays them propersalaries. The circular ends with a R.S.V.P. to theaddressee, to which we may hope the reply will bevery prompt.
AT a meeting of the court of Edinburgh Universitylast week, intimation was made of a grant from theRockefeller Foundation for research work in neuro-surgery. The work will be carried out by a team ofworkers under the direction of Mr. Norman Dott,and the grant which totals 7500 will be applied tothese studies during the five years from June 1st,1936. A special ward will be provided for Mr. Dott’suse at the Royal’ Infirmary.