CXNVI1 es 
NATURE 
[NOVEMBER 20 913 
N.P.L. PHOTOMETER BENCH 
MADE BY 
ALEXANDER WRIGHT & CO., Ltd., 
WESTMINSTER. 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
The “ HARRIS ” 
SPECTROMETER. 
A cheap and reliable Instrument specially designed for 
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.) 
Apparatus to determine the 
Full particulars and instructions may be obtained from 
A. GALLENKAMP. & CO., 
expansion undergone during the 
d 
freezing of water. 4 
Designed by J. K. KING, M.A. 
the Sole Makers: 
TOWNSON & MERCER.) 
LTD. 
34 Camomile Street, London, E.C, — 
Laboratory Klinostat 
Withvery powerful 
one-speed clockwork 
movement, 
per 15 to 20 minutes, 
diameter of rotating 
disc 24 ems., weight 
without flower pot 
22 lbs., for vertical, 
horizontaland inclined 
observations, complete 
with 4 hooks, 
As List No. V 5669. 
Price 
£5 50 
Extract from our 
Botany and Plant 
Physiology List No.61, 
a copy of which will 
be sent on application. 
aa See favourable edi- 
torial notices: NATURE, 
Oct. 17, 1912, page 197; 
SCHOOL WORLD, Novw., 
1912, page 437. 
Ltd., 
19 & 21 Sun Street, Finsbury Square, London, E.C, 
Printed by RicHarp CLay & Sons, Limirep, at Brunswick Street, Stamford Street, Ss. E., 
and THE Macmicvian Co., 66 Fifth Avenue, New York.—THurspay, November 20, 1913. 
St. Martin's Street, London, W.C., 
and ‘published by MacMILLAN aNnp Co., LimitTEp, at 
