civ NATURE [NovEMBER 6, 1913 
Apparatus to determine the 
expansion undergone during the 
freezing of water. 
Designed by J. KH. HING, M.A. 
NOW READY. 
NEW LIST 
RHEOSTATS 
LABORATORY & 
GENERAL WORK 
Price 
Sd: net. 
ISENTHAL & CO. 
(Department 1) 
DENZIL WORKS, NEASDEN, 
LONDON, N.W. 
Contractors to the Admiralty, War, India, and 
Colonial Offices, &c. 
Nil 
Full particulars and instructions may be obtained from 
the Sole Makers: 
TOWNSON. & MERCER. 
LTD. 
| 34 Camomile Street, London, E.C. 
CATALOGUE No. 6I 
Consisting of 200 pages, profusely illustrated, of 
APPARATUS FOR 
BOTANY AND — 
PLANT PHYSIOLOGY 
INCLUDING 
SCIENTIFIC INSTRUMENTS 
OF ALL DESCRIPTIONS. 
The “‘ HARRIS” 
SPECTROMETER. 
Botanical Material (Brcsh.an¢ 
Botanical Series of Microscopic Slides. 
ME- NATURE says: “This catalogue, in 
which every requisite for the study of plant 
physiology is listed, with numerous illustra- 
tions of special apparatus for physiological 
experiments as well as of general laboratory 
materials, is zndispensable to teachers of 
botany. The chief feature of the catalogue 
is the listing of the apparatus described in 
standard text-books on plant physiology.” 
See also favourable notice in ‘SCHOOL WORLD,” 
Nov. 1912, p; 437- 
A. GALLENKAMP & CO., Ltd. 
19-21 Sun St., Finsbury Square, London, E.C. 
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., tro. 
BIRMINGHAM 
(ENGLAND.) 
Printed by Ricuarp Cray & Sons, Limrrep, at Brunswick Street, Stamford Street, S.E., and published Wy MacMILLAN AND Co,, LimiTep, at 
St. Martin's Street, London, W.C., and THE Macmitian Co., 66 Fifth Avenue, New York.—TuHurspay, November 6, 1913 
ee ee ee 
+ a a ie ow 
i 
i 
; 
