Pee , ; DOGS 6 













A WEEKLY ILLUSTRATED JOURNAL OF SCI NOE, ass 
“* To the solid ground Lo nat Mus? 
Of Nature trusts the mind which builds f.r aye.”’—\WORDSWORTH. 

No. 2783, VOL. 111] SATURDAY, MARCH 3, 1923. —« [PRICE ONE SHILLING 
Registered as a Newspaper at the General Post Office.) ~ [All Rights Reserved 
BALANGES & WEICHTS 







VITREOSIL 
LABORATORY WARE 
Superior to Porcelain 
Constant in Weight 
Best Substitute for 
Platinum 
and more Economical 
ASK YOUR DEALER FOR IT 
SOLE MANUFACTURERS 
THE THERMAL SYNDICATE, LTD., 
VITREOSIL WORKS—WALLSEND-ON-TYNE. 
LONDON DEPOT 28 eae S.W.1. 
F.E:BECKER & C° 
W. & J.GEORGE (LONDON) L"® PROPRIETORS 
17 to 29 HATTON WALL, LONDON.E-C.1 


RECORDING ASSMAN 
PSYCHROMETER 
‘with Ventilating Fan and Electric Motor. 
Write for full particulars. 
Particulars and Prices.on application to— 
JOHN J. GRIFFIN & SONS, L™. EGRETTI @ ZKMBRA 
Kemble Street, Kingsway, 38,HOLBORN VIADUCT.E.C.h. 
London, W.C.2. LONDON. 


