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ERRATA.-By a typographical error, which will have been evident at aglance, the diagrams of the internal popliteal nerve illustratingProfessor Marshall’s lecture last week were wrongly described. Thewords "stretched" and unstretcbed" attached to the pair of sec-tions respectively should have been transposed.-An error occurred inthe report of Dr. Heron’s remarks at the Medical Society in THELANCET of last week. For "half a grain of morphia," read " a sixthof a grain."

COMMUNICATIONS not noticed in our present number will receiveattention in our next.

COMMUNICATIONS, LETTERS, &c., have been received from-ProfessorMarshall, London; Professor Corfield, London; Professor Struthers,Aberdeen; Mr. Lennox Browne, London; Mr. Wickham Barnes,London ; Mr. G. Shearer; Dr. Thompson; Mr. Flack ; Dr. J. Ross;Mr. T. W. Nunn, London; Mr. Cauty, Liverpool; Mr. L. Schlesinger,Peckham; Mr. Herschell, London; Dr. H. G. Taylor, Lancaster;Dr. Gairdner, Glasgow; Mr. Whitwell, Shrewsbury; Mr. Darlington,Ruabon ; Mr. Wright, Rothesay; Mr. Lauder, Manchester ; Mr. Clegg ;Deputy Surgeon-General Glasse, Guernsey ; Surgeon-Major Jazdowski,Woolwich; Mr. Lawley Parker, Manchester; Dr. Barlow, London;Dr. Fergus, Marlborough; Mr. Sympson, Lincoln; Mr. J. R. Forrest,Hull; Dr. A. J. Marston, Worcester, Miss.; Dr. Broadbent, London ;Mr. W. Bennett, Liverpool; Dr. Quinlan, Dublin ; Dr. Campbell,Garlands; Mr. Gmelin, Highworth; Mr. Batterham, Wolverhampton ;Mr. J. S. Wood, London; Mr. R. R. Anderson; Mr. Flynn, Lowmoor;Mr. Hall; Mr. Haly, Padstow; Dr. Hacon, Christchurch, N.Z. ;Dr. Steavenson, London; Dr. Herman, London; Mr. G. C. Purvis,London; Dr. C. F. Hutchinson, Scarborough ; Mr. Wylie, Newport;Mr, Gamgee, Birmingham; Mr. Home, Scarborough; Mr. Draught,Oldham ; Mr. Godlee, London; Messrs. Austin and Son, Clifton;Mr. Allen; Messrs. Bains and Co., Leeds; Mr. Byerley, Portsmouth;Mr. Hughes, Leicester; Mr. Somers, Hornsey ; Mr. Milne, Kendal;Dr. Hayward, Buxton; Mr. Tostas, Turin; Mr. W. J. Fraser, London ;Dr. R. B. Watkins, Baltimore; Mr. A. B. Kelly, London ; Dr. Allan,Pietermaritzburg; Dr. Fitzpatrick, Folkestone; Dr. Kirkpatrick,Edinburgh; Mr. Chippendale; Mr. Walter Whitehead, Manchester;Mr. H. G. B. Russell, London ; Mr. Madigan, Ktlrush; Dr. Willans,Great Hadham; Mr. H. Kimpton, London; Mr. Jennings, Bath;Dr. Monks, Aden; Messrs. Nathan and Co., London; Mr. Manfield ;Mrs. Evans, Ashford; Dr. Burnet, London; Dr. Lucas, Bombay;Mr. Rutherford, London; Mr. Porknell, Exeter; Mr. Alban Doran,London; Medicus, Birmingham ; Care ; Y., Rochdale; Crux ; Dr. J. ;Union; G. H., Kilburn; A. B. ; &c., &c.

LETTERS, each with enclosure, are also acknowledged from-Dr. Taylor,Omagh; Mr. Faulkner, New Zealand; Mr. M’Kenzie, Stornaway;Mr. Anderson, Canterbury, New Zealand; Mr. Smith, Greymouth,New Zealand; Mr. Lambert, London ; Messrs. Kemp and Co., London;Messrs. Lee and Martin, Birmingham ; Mr. Wheeler, Attleborough ;Mr. Jones, Sheffield ; Mr. Pratt, Liverpool; Mr. Kemp, Castleford;Mrs. Claxton, Boscombe; Mr. Peter, Edinburgh ; Dr. J. W. Barnes ;Mrs. Wright; Mr. Fairbridge, London; Mr. Hewett, Leicester;Miss Bramwell, Perth; Mr. Alsop, Shipley ; Mr. Main, East Ilsley;Mr. Reid; Messrs. Hunter and Co., Aberdeen ; Surgeon. Ashford;L.R.C.S.; Beta; A.; F. R., Derby; D. D., West Brompton ; R. S.,Llanelly; W. P. P., Southsea ; M. J., Finsbury-park ; Anthara ; Spes ;A. W. B., Manchester; Zeta, Folkestone; M. 0., Bedford; Kairin,Liverpool; Medicus, Banagher; Surgeon, Bermondsey; &c., &c.

Wharfedale and Airedale Observer, Western Moining News, NantwichGuardian, Bristol Mercury, El Eusayo Medico, St. Pancras Advertiser,St. Pancras Gazette, &c., have been received.

Medical Diary for the ensuing Week.Monday, Dec. 24.

ROYAL LONDON OPHTHALMIC HOSPITAL. MOORFIELDS.—Operations,10½ A.M. each day, and at the same hour.

ROYAL WESTMINSTER OPHTHALMIC HOSPITAL.-Operations, 11 P.M. eachday, and at the same hour.

METROPOLITAN FREE HOSPITAL.—Operations, 2 P.M.ROYAL ORTHOPEDIC HOSPITAL.-Operations, 2 p.MST. MARK’S HOSPITAL.-Operations, 2 P.M. ; on Tuesday, 9 A.M.HOSPITAL FOR WOMEN, SOHO-SQUARE.—Operations, 2 P.M., and on

Thursday at the same hour.

Tuesday, Dec. 25.GUY’s HOSPITAL.—Operations, 1½ P.M., and on Friday at the same hour.

Ophthalmic Operations on Mondays at 1.30 P.M., and Thursdays at2 P.M.

WESTMINSTER HOSPITAL.-Operations, 2 P.M.WEST LONDON HOSPITAL.—Operations, 2.30 P.M.

Wednesday, Dec. 26.

NATIONAL ORTHOPEDIC HOSPITAL.—Operations, 10 A.M.MIDDLESEX HOSPITAL.-Operations, 1 P.M.ST. BARTHOLOMEW’S HOSPITAL.—Operations, I! P.M., and on Saturday

at the same hour.-Ophthalmic Operations on Tuesdays and Thurs.days, at 1.30 P.M.

ST. MARY’S HOSPITAL.-Operations, 1½ P.M.-Skin Department:9.30 A.M., on Tuesdays and Fridays.

ST. THOMAS’S HOSPITAL.—Operations, 1½ P.M., and On Saturday at thesame hour.

LONDON HOSPITAL.-Operations, 2 P.M., and an Thursday and Saturdayat the same hour.

GREAT NORTHERN HOSPITAL.—Operations, 2 P.M.SAMARITAN FREE HOSPITAL FOR WOMEN AND CHILDREN.—Operations,

2½ P.M.UNIVERSITY COLLEGE HOSPITAL.—Operations, 2 P.M., and on Saturday

at the same hour.-Skin Department: 1.45 P.M., and on Saturday at9.16 A M.

Thursday, Dec. 27.ST. GEORGE’S HOSPITAL.—Operations, 1 P.M.ST. BARTHOLOMEW’S HOSPITAL.—1½ P.M. Surgical Consultations.CHARING-CROSS HOSPITAL.—Operations, 2 P.M.CENTRAL LONDON OPHTHALMIC HOSPITAL.-Operations, 2 P.M., and on

Friday at the same hour.NORTH-WEST LONDON HOSPITAL.—Operations, 2½ P.M.ROYAL INSTITUTION.-3 P.M. Professor Dewar, "On Alchemy."

Friday, Dec. 28.ST. GEORGE’S HOSPITAL.—Ophthalmic Operations, 1½ P.M.ST. THOMAS’S HOSPITAL.—Ophthalmic Operations, 2 P.M.ROYAL SOUTH LONDON OPHTHALMIC HOSPITAL.—Operations, 2 P.M.KING’S COLLEGE HOSPITAL.—Operations, 2 P.M.

Saturday, Dec. 29.KING’S COLLEGE HOSPITAL.-Operations, 1 P.M.ROYAL FREE HOSPITAL.—Operations, 2 P.M.ROYAL INSTITUTION.—3 P.M. Professor Dewar, "On Alchemy."