cliv 
UNIVERSITY OF LONDON. 
NOTICE 1S HEREBY GIVEN, That the Senate will proceed to elect 
External Examiners for the Examinations, other than Medical, above 
Matr.culation for the year 1917-18 as follows :-— 
(k) Chemistry; (\) Geology; (m) Mathematics; (n) Physics; 
(0) Experimental Psychology ; (p) Zoology; (q) Electrical Tech- 
nology; (x) Agricultural Botany ; Rae ()) Agricultural Chemistry. 
The Senate will also proceed to elect External Examiners in subjects of 
the Examinations for Medical Degrees for the year 1917-18 as follows :-— 
HIGHER EXAMINATIONS FOR MEDICAL DEGREES. 
One in State Medicine. One in Surgery. 
One in Forensic Medicine and Hygiene. 
FIRST EXAMINATION AND SECOND EXAMINATION, 
PART I, FOR MEDICAL DEGREES. 
One in General Biology, One in Physics, and One in Chemistry. 
N.B. Attention is drawn to the provision of Statute 124, whereby the 
Senate is required, if practicable, to appoint at least one Examiner who is 
not a Teacher of the University. 
Particulars of the remuneration and duties can be obtained on application. 
Candidates must send in their names to the External Registrar, Geo. F. 
Goodchild, M.A., B.Sc., with any attestation of their qualifications they 
may think desirable, on or before WEDNESDAY, JANUARY 31, 1917, 
in respect of Examinerships other than Medical ; and on or b fore SA'TUR- 
DAY, FEBRUARY 17, 1917, in respect of Medical Examinerships. 
It is particularly desired by the Senate that no application of any kind be 
made to its individual Members. 
If testimonials are submitted, three copies at least of each should be sent* 
Original testimonials should not be forwarded in any case: If more than one 
Examinership is applied for, a separate complete application, with copies of 
testimensals, if any, must be "forwarded in respect of each. No special form 
of application is necessary. 
University of London, 
South Kensington, S.W. 
ASSISTANT METALLURGIST. 
Vacancy for Temporary Woman Assistant in Metallurgical 
Research Laboratory. Salary, £130 per annum, Candidates 
should be University Graduates with some knowledge of 
photography. Applications, with copies of testimonials, 
to be forwarded to the SUPERINTENDENT OF RESEARCH, 
Royal Arsenal, Woolwich. 
BLACKBURN MUNICIPAL 
TECHNICAL SCHOOL. 
Applications are invited for the post of chief Assistant Lecturer in 
Chemistry. Salary about £250 per annum, according to qualifications and 
experience. Women eligible. The post is not of a t:mporary character. 
Applications should be sent as soon as possible, and not later than Feb. 2nd, 
to Dr. R. H. Pickard, Principal, Technical School, Blackburn, from whom 
information respecting the post can be obtained. 
A. H. WHIPPLE, Director of Education. 
THE UNIVERSITY OF LEEDS. 
DEPARTMENT OF AGRICULTURE. 
Applications are invited for the position of additional Instructor in Horti- 
culture. Salary £150 a year. Applications will be received up to 
January 24, 1917, and should he addressed to ‘'He Secretary, The Uni- 
versity, Leeds, from whom further particulars may be obtained. 
Edueational, Medieal, all other 
BOOKS : subjects, and for all Exams, 
SECOND-HAND AT HALF PRICES: New Books at Discount Prices. 
CATALOGUES FrEE. State Wants. Books sent on approval 
BOOKS BOUGHT: Best Prices Given. 
W. & G, FOYLE, 121-123 Charing Cross Road, London, 
Books on Selentifie, Technical, 
BOOKS, MAGAZINES 
and PERIODICALS 
Despatched regularly to all parts. 
Can we send you particulars of our 
POSTAL SERVICE? 
Individual requirements studied and lowest 
prices quoted. 
E. GEORGE & SONS, Ltd., 
23 Jacob Street, London, $.E., England. 
NATURE 
[January 18, 1917 
SECOND-HAND MICROSCOPES. 
Baker ‘‘D.P.H.,’’ No, 1, mechanical stage and substage, 
2/3, 1/6, and 1/12 cil imm. objectives, by Bausch & i Gib 
triple nosepiece, 2 eyepieces, achromatic Abbe condenser... £18 18 
Bausch & Lomb Whar rie ol 2 eahs of objectives, 
2 pairs of eyepieces, as new re 
Beck ‘* Popular’’ Binocular, 2-in. 5 rin., and fin. objec- 
tives, 2 pairs of eyepieces, and _polariser one nS 
Leitz IIb, Nos. 3 and 6 objectives, 2 eyepieces, Abbe and 
iris . - 
Beck Small ‘‘ London,” 2/3 and 6 objectives, double nose+ 
piece, 2 eyepieces, spiral Abbe and iris aoe ane 
Zeiss, with triple nosepiece, 2 eyepieces, Abbe and i iris one 
Leitz IIb, A and D Zeiss objectives, double nasepicers eye- 
piece ... ase + on 
Beck ‘* Economic,” 1-in. and 3 objectives, 2 eyepieces ose 
. £15 0 
£8 15 
£7 15 
£7 15 
£7 15 
£61 
£6. a 
eo 00 oo 6 8 
WANTED: 
MICROSCOPES and ACCESSORIES 
by Leading Makers. 
CLARKSON’S SECOND-HAND OPTICAL MART, 
338 HIGH HOLBORN, LONDON, (Opposite Gray's Inn Road.) 
X-RAY TUBES 
FOR 
RESEARCH WORK 
INCLUDING THOSE WITH TUNGSTEN ANTICATHODES 
BRITISH MADE THROUGHOUT 
A. C. COSSOR, LTD., 
59-61 Clerkenwell Road, London. 
[ Rapa ON HIRE 
(Activity 1,800,000). 
RADIUM MICROSCOPES, 
Complete with Radium, 2/6 and 7/6 each. 
These are SELF-LUMINOUS in the dark, 
showing splendid Scintillations. 
Pitchblende Scintilloscopes, 
Extra Screens for gestion Minerals, 
7/6 each. 
1/6 each, 
F. HARRISON GLEw, 
156 Clapham Rd., London, eae 
Telephones : 1787 Hop and 3117 Hop. 
(D -Teees 5 ON | Ge F eS 
THE BRITISH OXYGEN COMPANY LTD. 
Works for the production of Oxygen and other gases in London 
(Westminster, Greenwich and Stratford), Birmingham, Cardiff, 
Wolverhampton, Manchester, Birkenhead, Sheffield, 
Newcastle-on-Tyne, Glasgow, and Sydney, N.S.W. 
The Company was formed in 1886 as Brin’s Oxygen Company to 
develop means for the production of Oxygen on an industrial scale, 
The Company is not only the acknowledged pioneer of the Oxygen 
Industry, but possesses the largest organisation in the World for the 
production an¢ distribution of that gas. 
The Company also manitfactures and supplies in cylinders, 
NITROGEN, HYDROGEN, CARBONIC ACID, and other gases. 
The Company has developed an extensive engineering business, and 
has specialised in the design and manufacture of Plant for the production 
and separation of gases by liquefaction, electrolysis, and other methods. 
The Company is the exclusive manufacturer in the United Kingdom 
of apparatus tor metal cutting by Oxygen, and also manufactures well- 
known types of gas Regulators, Oxy-Acetylene and other blowpipes, and a 
large variety of apparatus tor use with gas cylinders. 
For illustrated price lists and full particulars application should be sade 
to any of the Company's Works or to the Head O ce, Elverton —= 
"Westminster, S.W. 
