A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“To the solid ground 
Of Nature trusts the mind which builds for aye.”-—WorRDSWORTH. 
_ NO. 2462, VOL. 98] 
THURSDAY, JANUARY 4, 1917 
[PRicE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
[All Rights Reserved. 
| Meteorological Charts. 
Complete Sets for the Year for recording 
Barometric Pressure, Temperature, Rain- 
fall, Direction of Wind, &c. 
} 1/- each. Post Free, 1/2 
Special “College” Design, large size, 
for School use, 2/6 
Meteorological Instruments of all sorts, 
Chemical Weather Glasses, &c., in stock, 
NEWTON & CO., 
OPTICIANS TO H.M. KING GEORGE V., 
72 WIGMORE ST., LONDON, W. 
ESTABLISHED OVER 200 YEARS. 
DUROGLASS L”: 
14 CROSS STREET, HATTON GARDEN, E.C. 
Manufacturers of 
Borosilicate Resistance Glassware. 
- Beakers. Flasks, Etc. 
Soft:Soda Tubing for Lamp Work. 
General Chemical and 
Scientific Glassware. 
Special.Glass Apparatus Made to Order. 
DUROGLASS WORKS, WALTHAMSTOW. 
: AGENTS: 
BAIRD & TATLOCK (LONDON) LTD. 
14 CROSS ST., HATTON GARDEN, E.C. 
BEAKERS, BOATS, 
specialise 
in the manu- 
facture of 
apparatus to cus- - 
New prices and sample 
on .application to 
THE SILICA SYNDICATE, Ltd., 
82 HATTON CARDEN, 
LONDON, E.C. 
Telephone: Holborn 6380. 
A New Barograph—THE ‘‘ JORDAN.” 
(Regd. Design 62871.) 
Shows at a glance the movements of the barometer during 
the preceding days. 
Descriptive Leaflet post free on application to 
NEGRETTI & ZAMBRA, 
38 HOLBORN VIADUCT, E.C.; 
45 CORNBILL, E.C.; 122 REGENT ST., W. 
