14 
REICHERT MICROSCOPES 
AND ACCESSORIES FOR ALL SCIENTIFIC RESEARCHES 
including GEOLOGICAL AND METALLURGICAL 
PHOTO-MICROGRAPHIC & PROJECTION APPARATUS 
MICROTOMES 
APPLY TO 
(Reichert) 
O. C. RUDOLPH & BEESLEY 
65 MARGARET STREET, OXFORD CIRCUS, LONDON, W.l 
BROWNING’S DIFFRACTION GRATING SPECTROSCOPES. 
Browning’s Spectrometers for Laboratory Research. 
Browning’s Replicas of Rowland Diffraction Gratings. 
Thorium Micro Lamp (Prof. Cheshire’s). Price List Post Free. 
Selected Stock of New and Second-hand Microscopes and Accessories. 
JOHN BROWNING ( Esta n 65 Shed ) 37 Southampton St., Strand, London, W.C.2 
If you are in need of any second-hand Book on Natural History or Science 
apply to 
DULAU & CO. Ltd., 
34, 33, 36, Margaret Street, 
Libraries purchased. Cavendish Square, London, W.l 
SECOND-HAND AND NEW 
MICROSCOPES AND ACCESSORIES 
at prices to suit all users 
CLARKSON’S, 338 High Holborn, LONDON, W.C.i 
Tel. : HOLBORN 2149 . (Opposite Gray’s Inn Road) 
SPECIAL TO STUDENTS 
and those requiring a first-class Micro- 
scope. We are able to offer a few only 
of the well-known Koristka Folding Travelling Microscopes, which are 
brand new, and listed at £3S, at a specially reduced price of £20. This offer is made to ensure 
immediate disposal of our stock of this model, and to make room for a slightly improved 
pattern which is now ready for delivery from the factory. 
There are only a few for disposal, and the offer can under no circumstances be repeated. 
We will arrange to supply on Deferred Payment Terms if desired — £4 cash down and twelve 
equal payments of £1 9s. 4 d. Strict approval if desired. 
Specification. — Koristka 1922 Model, compact folding pattern, fine and coarse adjust- 
ment, square stage, three eye-pieces, and three objectives, f , i and J^-inch oil immersion, 
Abbe ' condenser, with iris, complete in case, and special platform for use of Microscope on 
tripod stand. These are brand new 1922 instruments, not second-hand. To secure one of 
the limited number immediate application must be made. 
THE CITY SALE & EXCHANGE, 52 Chcapsidc, E.C.2 
