XciVv NATURE [OcToBER 30, 1913 
[EITZ EDUCATIONAL METEOROLOGICAL 
LARGE TRAVELLING MICROSCOPE INSTRUMENTS. 
conforms in its dimensions and general design to Model D. It is fitted 
with the new form of fine adjustment, having continuous cam and worm 
screw movement with milled heads at the sides. This imechanism, after 
several years of practical test, has proved to be superior in action and 
more durable than the micrometer screw. 
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Maximum and Minimum Thermometers. 
Hygrometer. 
Screen to contain the 4 Thermometers. 
Rain Gauge with Glass Measure. 
Meteorological Register for one year. 
eee. |” | The Set complete £3 15 O 
, Kew Certificates, 12s. Gd. extra. 
ILLUSTRATED CATALOGUE, PART II, POST FREE 
Price, complete in case, with Abbe condenser, iris diaphragm 
and worm focussing screw, triple nosepiece, objectives 
3” and }”, eyepieces I. and II. ... bss * er <5 | 
Ditto and 7” oil immersion objective and eyepiece IV. ... 1 
Ditto ditto and mechanical stage ree dip 2 
2 
2560 
Spe 1 o-p | Os EX. STEWARD, Ltd., 
Ditto ditto ditto and dark ground condenser... 3 1 0 
Sectional Cata'ogues post ees Opticians & Scientific Instrument Makers to the British & Foreign Govts. 
18 BLOOMSBURY SQUARE, W.C. 406 & 457 STRAND, LONDON. 
(4 few doors from the British Museum). ESTABLISHED 1852. 
9 have a world-wide reputation for Class and 
WAT ON S MICR SCOPES Laboratory Work. They are unequalled for 
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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- 
ments of the stage work on the same axis. Vertical lever, side limb fine adjustment. All working parts are slotted and sprung 
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 Boa ne a i x - «= £12 oo 
Ditto with 2 Eyepieces, Objectives 2/3” and 1/6” N.A. 0.74, With x millimetre working distance, 
new aplanatised Abbe Illuminator with Iris Diaphragm, Double Nosepiece, complete in Mahogany Case - £17 17 § 
WATSON 'S 1/12” Oil Immersion Objective, 1'30 N.A., gives a flat field and exquisite definition .:. #85 nee £5 Oo 
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. (*3B!s"4), 313 High Holborn, London, W.C. 
Optical Works—HIGH BARNET, HERTS. 2 EASY ROW, BIRMINGHAM. 
Branches / 16 FORREST ROAD, EDINBURGH. Depots {212 NOTRE DAME STREET, MONTREAL, CANADA. 
(184 GREAT PORTLAND STREET, LONDON, W. 78 SWANSTON STREET, MELBOURNE, AUSTRALIA. 
SPENCER MICROTOMES == 
820 Rotary Microtome - - - §20 12 0 
The most reliable Instrument made, 
880 Automatic Laboratory Microtome - 829 5 O 
With special motion of the knife. 
Unequaliled for frozen section work. 
PRICE LIST ON APPLICATION. 
SOLE AGENTS FOR GREAT BRITAIN AND IRELAND (EXCEPT LONDON). ) tig 
STANDLEY BELCHER& MASON. Lv... 
aie CHURCH STREET. BIRMINGHAM, 
Printed by RICHARD Ciay & Sons, Limirep, at Brunswick Street, Stamford Street, S.E., and published by MAcMILLAN AND Co., Lrmirep, at 
St. Martin's Street, London, W.C., and THE Macmitvan Co., 66 Fifth Avenue, New York.—Tuurspay, October 30, 1913. 
