ccXVi NATURE [JANUARY 22, 1914 
: EDUCATIONAL METEOROLOGICAL 
eitz INSTRUMENTS. 
NEW 
HIGH POWER 
BINOCULAR | 
MIGROSGOPE | 
suitable for ordi- 
nary eyepieces and 
Maximum and Minimum Thermometers, 
objectives, from Hygrometer. 
the lowest to Screen to contain the 4 Thermometers. 
the HIGHEST Rain Gauge with Glass Measure. 
POWERS, in- Meteorological Register for one year. 
eluding oil The Set complete £3 15 O 
immersion Kew Certificates, 12s. Gd. extra. 
objectives. ILLUSTRATED CATALOGUE, PART II, POST FREE 
Particulars may be had on application J. H. STE WARD, Ltd., 
Sor Leaflet No. .20, post free. Opticians & Scientific Instrument Makers to the British & Foreign Govts. 
18 BLOOMSBURY SQUARE, W.C. 406 & 457 STRAND, LONDON. 
(A few doors from the British Museum.) FSTancisnep 1852. ie 
cea WY VATS. ON 3 > SROSCOPE 0. 
British Made at Barnet, Herts, Constructed on Scient.fic Principles for Scientific Work: 
This instrument is to be found in all Laboratories where precive work is a sive gud non. It embodies every con- 
venience for comfort, accurate and rapid work. Fach working part is slutted and sprung so that wear can be 
instantly compensated for. Compound substage pr vided with rackwork focussing and screw centering movements. 
‘The experience of vears proves that Watson’s Lever Fine Adjustment is unexcelled. 
PRICE—H” Edinburgh Students’ Microscope, Stand only... « —s B10 2 G 
“tH” Edinburgh Students’ Microscope, with Obvectives 2/3” and 1/6” N,A. } 
0°74 with one millimetre of working distance, Eyepieces Nos, 2 and 4, Double Nose- 
piece, Aplanatised Abbe I!lominator with tris Diaphragm. Complete in Mahogany Case 216 8 Oo 
1/12” Oil Immersion Objective N.A. 1°30, new computation, giving a very flat field 4 Oo 
WATSON’S MICROSCOPE CATALOGUE No. 2 ons full particulars of over 27 different Models and every kind 
oO ccessory. 
Microscopes and Apparatus for Histology, Botany, Biology. Bacteriology, Petrology, Metallurgy, &c., &c, 
Projection and Photo-micrographic Outfits. 
W. WATSON & SONS, Ltd., Optical Works—HICH BARNET, HERTS. 
Established 1837. 313 High Holborn, LONDON, wv.c. 
Branches—184 Great Portland Street London, W.C.; 16 Forrest Road, Edinburgh. 
Depots—2 Easy Row, Birmingham; 212 Notre Dame Street West, Montreal, Canada; 
78, Swanston Street, Melbourne, Australia. 
There are incorporated into 
SPENCER MICROSCOPES 
many features of practical usability, features which make for convenience 
and comfort in use as well as efficiency and durability, which others do not 
have, and which in part accounts for their popularity among the most 
careful laboratory workers. 
The whole story is told in our new 1913 Price Lists, which are gladly 
sent on application. 
We are sole agents for Spencer Microscopes for Great Britain and 
Ireland (except London). 
STANDLEY BELCHER & MASON, Ltd., Church Street, BIRMINGHAM 
Printed by RicHarp Cray & Sons, Limrrep, at Brunswick Street, Stamford Street, S.E., and published by MACMILLAN AND Co., LimiTED, at 
St. Martin's Street, London, W.C., and THe Macmician Co., 66 Fifth Avenue, New York.—TuHurspay, January 22, 1914. : 
