ccvi NATURE 
Simmance’s 
MICROMETER 
PRESSURE & VACUUM 
GAUGE 
indicates in thousandths of an inch, 
where other gauges only show tenths. 
Indispensable for accurate 
experiments. 
Made in suitable ranges to requirements. 
SOLE MAKERS :— 
ALEXANDER WRIGHT & CO. 
LTD. 
WESTMINSTER. 
TIFIG INSTRUMENTS 
OGIEN 
OF ALL DESCRIPTIONS. 
The “ HARRIS” 
SPECTROMETER. 
A cheap and reliable Instrument specially designed tor 
Students’ use. 
Very strongly constructed so that it may be used by 
elementary pupils without being put out of order. 
PRICE £2: 10:0 Each Net. 
Descriptive Pamphlet on application. 
PHILIP HARRIS & CO., iro. 
_ BIRMINGHAM 
(ENGLAND.) 
[JANUARY 15, 1914 
ALUNDUM 
EXTRACTION — 
THIMBLES 
For rapid filtration, without 
previous preparation. 
a 
Unaffected by solutions of acids 
or alkalies used in ordinary 
analytical work. Quickly dried © 
to constant weight, 
Diameter 25 mm.; height 70 mm , 
1/8 each. 
Diameter 30 mm.; height 80 mm. 
2/41 each. 
Manufactured by the Norton Co.,. 
Mass. 
SOLE AGENTS: 
TOWNSON & MERCER. 
34 CAMOMILE ST., LONDON, E.C. 
NEW SECTIONS 
(ready or ready early in February) of 
PART Ill. 
of our 
Large Science Catalogue 
SEcTION 1.—Calorimeters, Flash Point Apparatus, 
Pyrometers and all the Special Apparatus required 
in Engineering or Steel and Iron Laboratories. 
118 pages. (eady.) 
SECTION 2.—Charts, Maps, Lantern Slides, Lecture 
Lanterns, Museum Jars, Mining Apparatus, 
Botanical and Crystal Models. About 200 pages. 
(Ready early in February.) 
SECTION 3.—Models of Fungi. 32 pages. (Ready.) 
SEcTION 4.—Anatomical Models (Human). 38 pages. 
( Re ady. ) 
SEcTION 5.—Anatomical Models (Animal). 26 pages. 
(Ready.) 
OTHER SECTIONS TO FOLLOW. 
Please write for copies. 
A. GALLENKAMP & CoO. Ltd. 
19 & 21, Sun Street, London, E.C. 
Printed by RicHarp Cray & Sons, Limirep, at Brunswick Street, Stamford Street, S.E., and published by MacmILLan AND Co., LIMITED, at 
St. Martin's Street, London, W.C., and THe Macmittan Co., 66 Fifth Avenue, New York.—Tuurspay, January 15, 1914. 
