x NATURE 


NATIONAL UNION OF SCIENTIFIC 
WORKERS. 
25 VICTORIA STREET, LONDON, S.W.1. 
The ANNUAL COUNCIL MEETING of the UNION 
will be held at the Caxton Hall, Westminster, on Saturday, 
January 13, 1923, at 2.30 P.M. 
The ANNUAL DINNER of MEMBERS of the UNION 
will be held at the Florence Restaurant, Rupert Street, W.1, 
on Saturday, January 13, 1923. Assembly, 7 P.M. Morning 
Dress. 
The GENERAL SecrETARY, N.U.S.W., will be obliged if 
members wishing to attend would make immediate application 
to him. 

IMPERIAL COLLEGE OF SCIENCE 
AND TECHNOLOGY, 
SOUTH KENSINGTON, S.W.7. 
DEPARTMENT OF OPTICAL ENGINEERING 
AND APPLIED OPTICS. 
The usual Classes are being continued during the SPRING TERM, and 
in addition the following will be given :— 
CoLour AND ITs MEASUREMENT.—A Course of TEN Weekly Experi- 
mental Lectures beginning on Tuesday, January 16, at 6.30 p.m. will be 
given by Dr. L. C. MARTIN. 
Tue MecHANicaL DesiGN of THE Common Microscopz.—A Course 
of SIX Weekly Lectures will be given by Professor POLLARD on Thursday 
at 6 P.M., commencing January 18. 
For further particulars and for admission tickets apply to the REGISTRAR 
at the above address. 
The Director is open to receive applications from students and others 
desirous of carrying out research work in the Laboratories. 
UNIVERSITY OF LONDON. 
A Course of eight Lectures in Physiology on ‘THE MATHEMATICAL 
Basis oF PuysiococicaL Proptems” will be given by Mr. W. A. M. 
SMART, M.B., B.S., MR.C.S., L.R.C.P., B.Sc., at the Lonpon 
Hospitat Mepicat CoLiece (Turner Street, Mile End, E.1)on THurspDays, 
January 18 and 25, February 1, 8, r5, 22, and March 1 and 8, 1923, at 
4.30r.M. ADMISSION FREE, WITHOUT TICKET. 
EDWIN DELLER, Academic Registrar. 


UNIVERSITY OF CAPE TOWN. 
SENIOR LECTURESHIP IN PHYSIOLOGY. 
The University invites applications for the POST of SENIOR 
LECTURER in the DEPARTMENT of PHYSIOLOGY at a salary 
of £450 per annum rising by annual increments of 425 to a maximum 
of £650 per annum. (The successful applicant, if a qualified medical 
practitioner, will be allowed a salary of £500 for the first three years of his 
appointment.) 
An allowance of £40 will be made for passage money. 
The lecturer must become a member of the University Teachers’ Super- 
annuation Fund. 
The successful applicant will be expected to assume duty on March 12, 
1923, or as soon thereafter as possible. Salary commences from date of 
assumption of duty. 
Applications and copies of testimonials, all in duplicate, must reach the 
SEcrETARY, Office of the High Commissioner for the Union of South Africa, 
Trafalgar Square, W.C. (from whom Forms of Application and further 
particulars may be obtained), not later than January 31, 1923. 

UNIVERSITY OF LONDON. 
The Senate invite applications for the UNIVERSITY CHAIR of 
ZOOLOGY tenable at Bedford College. Salary £800 a year. Applica- 
tions (12 copies) must be received not later than first post an April 16, 1923; 
by the AcApemic RecisTrar, University of London, South Kensington, 
London, S.W.7, from whom further particulars may be obtained. 

INSTRUCTOR—Physics or Mathematics.— 
For one or more terms, London area. M.A., first-class honours, 1910 
(also full B.Sc. courses). 3 years’ experience lectures and demonstrating, 
also in Economics. Box 46, c/o NATuRE Office, 
GERMAN GENTLEMAN (30) requires 
position of trust with optical instrument firm in England. Ten years’ 
experience with renowned scientific instrument firms in Germany. 
Holder of States-certificate for opticians. Reply, Box 1346, NATURE 
Office. 





[JANUARY 13, 1923 
SCIENCE PROGRESS 
A QUARTERLY RECORD OF SCIENTIFIC 
THOUGHT, WORK, AND AFFAIRS 
Editor: Sir RONALD ROSS, K.C.B., F.R.S., &c. 
171 pages. JANUARY 1923. 
Recent Advances in Science: Pure Mathematics ; 
Meteorology ; Physical Chemistry ; Geology; Botany; Plant 
Physiology ; Zoology ; Anthropology. 
Articles: 
Gelatin. By T. Slater Price, O.B.E., D.Sc., F.1.C. The 
Analysis of Crystal-Structure by X-Rays. By W. T. Astbury, 
B.A. Some Characteristics of the Virus Diseases of Plants. 
By E. J. Butler, C.I.E., D.Sc., M.B. 
Popular Science: 
The Scientific Pictures of Joseph Wright. By F. W. Shurlock, 
B.A., B.Sc. 
Notes: 
The Prince of Monaco, By Sir A. E. Shipley, F.R.S. ; Col. 
E. H. Grove-Hills, C.M.G. ; Alfred Noyes on Recent Literary 
Tendencies; Notes and News; Scientific Politics—V. The 
Election Analysed. P 

6s. net. 
Correspondence. 
The Mental Ability of the Quakers. By Edward Watkins. 
Essays: 
Industry and Biodynamics ; The Spontaneous Degradation of 
Culture. 
Essay-Reviews. 
Reviews of 46 Books, etc. 
JOHN MURRAY, Albemarle St.,. LONDON, W.1. 

New Series, No. 264 December, 1922 
THE 
QUARTERLY JOURNAL 
OF 
MICROSCOPICAL SCIENCE 
Honorary Editor: 
‘ 
Str RAY LANKESTER, K.C.B., M.A., D.Sc., 
LL.D., F.R:S. 
Editor: 
EDWIN S. GOODRICH, M.A., F.R.S. 
With the co-operation of SypNey J. Hickson, M.A., F.R.S.; Grpert 
C. Bourng, M.A., D.Sc., F.R.S. ; J. Granam Kerr, M.A., F.R.S. ; 
E. W. Macsripve, M.A., aoa F.R.S.; and G. P. Bipper, 
As, SCL): 
Subscription price per volume, B4, 4s. net. 
Single parts, £1, 1s. net. 
Contents of Number 264 
The Nature of certain Ovum-like Bodies found in the Seminiferous 
Tubules, by F. A, E. Crew and Honor B. Fett. From the Animal 
Breeding Research Department, University of Edinburgh. With Plates 
18-23.—Glossobalauus marginatus, a new species of Enteropneusta from 
the North Sea, by ALEXANDER Meek. With 14 Text-figures.—Studies 
on Insect Spermatogenesis. V. On the Formation of the Sperm in 
Lepidoptera, by Rosert H. Bowen. From the Department of Zoology, 
Columbia University. With Plates 24-26.—On the Biology and Struc- 
ture of the Larvae of Hydrophilus caraboides, L., by E. N. PavLovsky, 
M.D., D.Sc., Professor of Zoology at the Military Academy of 
Medicine, Petrograd. With Plate 27 and 16 Text-figures.—A further 
Account of the Spermatogenesis of Lice, by H. Granam CANNON, 
With x Text-figure.—Cannabalism in Amoeba vespertilio (Penard), by 
Grorrrey LapaGe, M.Sc., M.B., Lecturer in Zoology, The Victoria 
University of Manchester. With Plates 28, 29, and 3 Text-figures. 
OXFORD UNIVERSITY PRESS 
Humphrey Milford London, E.C.4 

