PUBLISHED AT THE OFFICE, 16, NEWCASTLE STREET, FARRINGDON ST.,
E.C.

JOURNAL OF PHYSICAL SCIENCE

Sir Wm. Crookes, O.M., F.R.S.] (WITH WHICH IS INCORPORATED THE "CHEMICAL GAZETTE").

Edited by

Establish Sixty-eight Years.

Published Weekly. Annual Subscription free by post £1. Entered at the New York Post Office as Second Class Mail Matter

2771. [Copyright Friday, January 3, 1913.

Vol. 107.-No. 2771. ved

CONTENTS

reserved

Registered as [PRICE_44.
a Newspaper. POST FRBS 41d.

PAGE

I

3

5

9

10

II

12

12

IMPERIAL COLLEGE of SCIENCE and TECHNOLOGY,
SOUTH KENSINGTON, LONDON, S. W.

DEMONSTRATORSHIP IN THE FUEL LABORATORIES,
DEPARTMENT OF CHEMICAL TECHNOLOGY.

Applications are invited, on or before January

18th, 1913, for the above Post, which will be vacant on February Ist next. For particulars apply to the SECRETARY.

BRADY & MARTIN, LTD. Newcastle-on-Tyne.
APPARATUS for Analysis, Research, and
Technical purposes.

CHEMICALS and Standard Reagents.
SOLE MAKERS of Sodeau's Gas Analysis Apparatus
and other forms for Special Research.

PLATINUM Utensils. We supply all forms

Victoria Bridge, Manchester.

CATALOGUES ON APPLICATION.

PLATINUM CRUCIBLES, UTENSILS, FOILS

WIRE and SCRAP.

Bought at Highest Prices.

LONDON REFINING & METALLURGICAL WORKS,

32, CLERKENWELL ROAD, LONDON, E.O. Bankers: LoN., CITY, & MID.

Telephone: 388 HOLBORN,

BROTHERTON & CO., Ltd.
Works: BIRMINGHAM, GLASGOW,
LEEDS, LIVERPOOL,
SUNDERLAND, and
WAKEFIELD.

AMMONIA

Offices:

and sizes of Platinum Utensils and Apparatus for Chemical and Physical purposes. All our utensils are hammered to shape, tested, and finished in the best manner. All kinds of Platinum scrap bought for cash or taken in exchange for new.-DERBY and CO., Ltd., City Chambers,

ENQUIRIES SOLICITED,