liv NATURE [OcToBER 2, 1913 
J. H. STEWARD’S 
BAROGRAPHS 
Giving a continuous record of atmospheric 
pressure. 
LEITZ MICROTOMES © 
By the aid of experienced mecnanicians and the use of 
modern and specially designed machinery, we are able 
to construct microtomes of the utmost precision in a 
large variety of models, from those used inclass work, 
to those of the highest excellence for research work. 
THE EDUCATIONAL BAROCRAPH, with $3 15 0 
ink and charts for one year 
Size 12 x 64 x 64 inches. 
THE LEITZ MINOT MICROTOME. 
Specially designed for cutting extra thin 
serial sections, and continuous ribbons. 
The carriage moves freely, yet without the slightest play. 
OTHER BAROGRAPHS in VARIOUS PATTERNS 
The universal clamp-holder is constructed on the principle from £4 4 O to £12 12 O 
of Hooke's key. 
PRICE (without knife or ribbon conveyor), £8, Iustrated Catalogue, Part Il, Post Free. 
Many other patterns from 15s. each. pa 
Microtome Catalogue post free. 
J. H. STEWARD, Ltd., 
E. LEITZ 18 SS SQUARE, Oplicians & Scientific Instrument Makers to the British & Foreign Gouls., 
(A few Shane the British Museum.) 406 & 457 STRAND, LONDON. 
ESTABLISHED 1852. 
9 ' have a world-wide reputation for Class and 
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rapidity, accuracy, and durability. 
British made at Barnet, Herts. Guaranteed for 5 Years. 
THE “RESEARCH” MICROSCOPE 
is of the size, design, and workmanship that give finest results with continuous working. Its many conveniences suit it for all classes of work with 
high or low powers, for original research or photography. It has :—Two inches of movement to the coarse adjustment for low-power work. 
Large top plate to stage. Mechanical stage with movements of 1}” horizontally and 1” vertically. Milled heads controlling move- 
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so that the smoothness of movement which characterises WATSON MICROSCOPES may be maintained for a lifetime. 
PRICES :—Research Microscope, as figured and described, Stand only ... ae ote ay ie as is sa . £12 00 
Ditto with 2 Eyepieces, Objectives 2/3” and 1/6” N.A. 0.74, with 1 millimetre working distance, 
new aplanatised Abbe Illuminator with Iris Diaphragm, Double Nosepiece, complete in Mahogany Case - SI § 
WATSON’S 1/12” Oil Immersion Objective, 1°30 N.A., gives a flat field and exquisite definition ... sae ag £5 0 
WATSON’S MICROSCOPE CATALOGUE ALSO GIVES DETAILS of Blood Counting Apparatus, Instruments for Bacteriology, &c. 
Copies will be sent gratis on request. 
W. WATSON & SONS, Ltd. (7*9237"°), 313 High Holborn, London, W.C. 
Optical Works—HIGH BARNET, HERTS. (2 EASY ROW, BIRMINGHAM. 
{16 FORREST ROAD, EDINBURGH. Depots; 212 NOTRE DAME STREET, MONTREAL, CANADA. 
(184 GREAT PORTLAND STREET, LONDON, W. 78 SWANSTON STREET, MELBOURNE, AUSTRALIA. 
LABORATORY BALANCES—— 
OFZ 
Branches 
{p 
) 
a aS a 
CHEMICAL APPARATUS. 
PURE ACIDS AND CHEMICALS. 
Sole Agents for Great Britain and Ireland (except London) for 
SPENCER MICROSCOPES, &c. 
MOST UP-TO-DATE MODELS. Sdn Price Lists free upon application. 
STANDLEY BELCHER& MASON, Lr0., 
CHURCH STREET. BIRMINGHAM. 
Printed by Richarp CLay & Sons, Limiren, at Brunswick Street, Stamford Street, S.E., and published by MACMILLAN AND Co., LIMITED, at 
St. Martin's Street, London, W.C., and THe Macmitcan Co., 66 Fifth Avenue, New York.—THuRspDay, October 2, 1913. 
EM 
ZA 
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