exlvi 

UNIVERSITY OF LONDON. 
A Lecture on “‘ THE RovaTion OF THE EARTH AND ITS INFLUENCE ON 
Optica, PHENOMENA” will be given by Pror, Dr. H. A. LORENTZ, 
F.R.S. (Professor of Physics in the University of Leiden), at UNivERsITY 
CoLLeGe, London (Gower Street, W.C.1), on THursSpAY, May 17, at 5.50 P-M. 
The Chair will be taken by Sir Witttam H. Braco, K.B.E., F.R.S. 
(Quain Professor of Physics in the University). ADMISSION FREE, 
WITHOUT TICKET. 
EDWIN DELLER, Academic Registrar. 
UNIVERSITY OF LONDON. 


A Lecture on “Tue Psycno.ocy or Epitersy” will be delivered in 
English by Dr. E. D. WIERSMA (Professor of Psychiatry and Neurology 
in the University of Groningen) in the RoperT BARNES HALL at the Royat. 
Sociery or Mepicixe, 1 Wimpole Street, W.1, on THurspay, May 24, at 
5.15 P.M. The Chair will be taken by Dr. Roperr H. Core, M.D., 
F.R.C.P. (Examiner in Mental Diseases in the University). ADMISSION 
FREE, WITHOUT TICKET. 
EDWIN DELLER, Academic Registrar. 

The Committee of the “‘ Vereeniging tot Be- 
vordering van de Opleiding tot Instrumentmaker” 
(Society for the Advancement of the Training 
of Mechanics), Leiden, Holland, announces 
VACATION COURSES FOR 
MECHANICS AND GLASSBLOWERS 
to be held in the last half of August in the work- 
shops of the Physical (Cryogenic) Laboratory 
of the University of Leiden. 
Prof. Dr. H. KAMERLINGH ONNES, 
President. 
Dr. C. A. CROMMELIN, 
Secretary-Treasurer. 
For information and application apply to 
Dr. CROMMELIN, 
Physical Laboratory, Leiden, Holland. 
THE ROYAL SOCIETY. 
MOSELEY RESEARCH STUDENTSHIP. 
The Secretaries of the Royal Society are prepared to receive applications 
fora MOSELEY RESEARCH STUDENTSHIP of the value-of £300 
per annum, awarded ‘‘for the furtherance of experimental research in 
Pathology, Physics, and Chemistry, or other branches of science, but not 
in Pure Mathematics, Astronomy, or any branch of science which aims 
merely at describing, cataloguing, or systematizing.” The appointment is, 
in the first instance, for two years, but may in exceptional circumstances be 
extended. P ; 
Applications must be received not later than June 1. Further particulars 
and forms of application can be obtained from the AssisTANT SECRETARY 
OF THE Roya Society, Burlington House, London, W.1. 
NATIONAL UNION OF SCIENTIFIC 
WORKERS. 
Tue AIM oF THE NATIONAL UNION or SCIENTIFIC 
WORKERS is to bring together into one professional organisa- 
tion all qualified scientific workers, viz. : 


Those engaged (a) In Higher Educational and Research 
Institutions. 
(4) In Industry and Consultative Practice. 
(c) In State and Municipal Scientific De- 
partments. 
Applications for membership are invited from all scientitic 
workers with university degree or equivalent professional quali- 
fication. Further particulars may be obtained from 
THE GENERAL SECRETARY, N.U.S.W., 
25 Victoria Street, S.W.1. ~ 
THE UNIVERSITY OF SHEFFIELD. 
The Council are about to appoint a PROFESSOR of MATHEMATICS. 
Applications should be received by the undersigned, from whom further 
particulars may be obtained, by June 5. 

W. M. GIBBONS, Registrar. 
NATURE 

[May 12, 1923 

CHELSEA POLYTECHNIC, 
CHELSEA, S.W.3. 
Day and Evening Courses in Science under Recognised Teachers 
of London University. 
I. INDUSTRIAL CHEMISTRY DEPARTMENT. — ™ 
Technical Courses in Analytical and Manvfacturing Chemistry, 
Pharmacy, Food and Drugs, A.I.C, Courses, Metallurgy, Assaying, 
Foundry Work, Research. 
Il. INDUSTRIAL PHYSICS DEPARTMENT. - 
Practical work in General Physics, Applications to Industries 
Metrology, Calorimetry, Illumination, Acoustics, Electr’ 
Measurement, Research. 
Ill. BIOLOGICAL AND GEOLOGICAL DEPARTMENT. 
Courses for B.Sc., etc., in Botany, Geology, Mineralogy, Zoology, 
Special Courses in Bio-chemistry, ae Sa ere Bacteriology, 
Physiology, Hygiene, Entomology, Plant Pathology. Course for 
Tropical Planters, Research. } 
SIDNEY SKINNER, M.A., 
Telephone: Kensington 8g9. Principal. 
re a 2 a 
BATTERSEA POLYTECHNIC, 
LONDON, S.W.11. 
Principal—RoBERT H. PicKarp, D.Sc., F.R.S. 
Head of Chemical Department—J. KENYON, D.Sc., F.1.C. 
Day and Evening Courses in Pure Chemistry (Inorganic and Organic) in 
preparation for University Degrees and A.I.C. and other professional exam- 
inations, 
Special Technological Courses in Chemical Engineering, Oils, Fats and 
Waxes, Mineral Oils and Waxes, Toilet Soaps Manufacture, Lubricating 
Oils and Greases, Paper Making and Paper Testing, Paper Making (Engin- 
eering), Commercial Paper Work, Applied Bacteriology, Testing of Disinfec- 
tants, Analysis of Foods, Waters, Fertilisers and Feeding Stuffs, Microscopy 
of Food and Drugs, Flour Milling, etc. 
The instruction is both theoretical and practical, fully equipped labora- 
tories being provided. . 

HOLLAND COUNTY COUNCIL (LINCS.). 
AGRICULTURAL INSTITUTE, KIRTON. 
The Committee is prepared to receive applications for the appointment of 
a BIOLOGIST on the staff of the above Institute. The person appointed 
will be required to assist with the instruction of students, when the Institute 
is opened for teaching purposes. He will be required to make a special 
study of methods of combating Plant Diseases, and must be pre d to 
carry out a considerable amount of experimental and advisory work in the 
Cone A special knowledge of Market Garden, Fruit and Seed Crops is 
essential. 
The commencing salary will be £300 per annum, plus travelling expenses 
according to scale. 
Applications, stating age and experience, together with not more than 
three recent testimonials, must be forwarded not later than May 25, 1923, 
to THE AGRICULTURAL ORGANISER, Kirton, near Boston, Lincolnshire. 
H. C. MARRIS, 
May 3, 1923. Clerk of the County Council. 

CITY AND GUILDS (ENGINEERING) COLLECE, S.W.7. 
ASSISTANT PROFESSORSHIP IN ELECTRICAL 
ENGINEERING DEPARTMENT. 
Owing to the appointment of Dr. Parker Smith to the Chair of Electrical 
Engineering at the Royal Technical College, Glasgow, the Delegacy will — 
proceed shortly to the appointment of an ASSISTANT PROFESSOR to 
deal particularly with the Traction and Design Sections of the Electrical 
Engineering Department. Candidates for the post will be expected to have 
had some experience of this work. Full particulars can be obtained from 
the SECRETARY TO THE DeLeGacy, The City and Guilds (Engineering) 
College, S.W.7. 

INDIAN INSTITUTE OF SCIENCE, 
BANGALORE. 
PROFESSORSHIP OF BIOCHEMISTRY. 
There will be a vacancy in the PROFESSORSHIP of BIO- 
CHEMISTRY in 1924. Applicants will be expected to have achieved 
some considerable reputation as research workers and must have had good 
experience in teaching. 
Particulars may be obtained from the Secretary, Cambridge University 
Appointments Board, University Offices, St. Andrews Street, Cambridge, 
who has been authorised to collect and forward applications to the Selecting 
Body. Applications should reach the Secretary by May 31, 1923. 
