cclviii 
‘NATURE 
[FEBRUARY 19, I914 
Leitz 
NEW 
BINOCULAR 
MICROSCOPE 
suitable for ordinary eye- 
pieces and objectives, 
from the lowest to the 
HIGHEST POWERS, 
including oil immersion 
objectives. 
Particulars may be 
had on application 
for Leaflet No. 20, 
E.LERTZ | WETZLAR e 
—= dost free. 
18 BLOOMSBURY SQUARE, W.C. 
(A few doors from the British Museum. ) 
A NEW OIL 
Watson’s New “ Versalic” 
(Mr. Conrady’s Latest Computation.) 
Has a flatter field than any other first-class Oil Immersion Objective. 
Medical men have asked for such a lens for many years, but this is the first practical answer to that request. 
The formula is different from that of any other Oil Immersion Objective. 
tion and counting it has no equal. 
It is constructed of hard durable glass. 
immovable. It has a long working distance of “43 m/m. 
All Laboratory workers should use Watson’s “Versalic” 
THE 
“LORD BURY” 
Telescope. 
Supplied in large numbers 
for use by Travellers and 
Sportsmen. 
Fitted with pancratie tube 
varying the power from 25 
to 35 diameters. 
Size closed, 10”; Mlustrated 
extended, 31”, Catalogue 
Partl. Free. 
Will make out wild fowl at The 
16 miles, will discern a > 
flagstaff at 22 miles, and “Lord Bury : 
name of lightship at 
to miles, Telescop e, 
in bronzed brass, 
POST FREB 
and fitted in Leather 
an Sling Case (weight of 
ceceipt of telescope 21b.30z.). ~ 
Remit- £4 4 Oo 
tance. 
(weight of telescope 1 Ib. 8 02z.). 
£5 15 O 
Opticians and Scientific Instrument Makers 
to the British G Foreign Govts., 
406 STRAND & 457 WEST STRAND, 
LONDON. 
Established 1852, — 
IMMERSION OBJECTIVE. 
;>-inch Oil Immersion Objective. 
Designed especially for Laboratory Use. 
The definition is superb. For systematic search work, blood examina- 
The front lens is 
y.=in, Oil Immersion Objective. 
Price £5 
It is not recommended for resolving Diatoms. 
It is computed specially for work on stained subjects 
Watson's Complete Catalogue of Microscopes (No. 2N) and of Microscopic Objects (No. NR) will be sent post free on request. 
W. WATSON & SONS, Ltd. (**s83;"""), 313 High Holborn, London, W.C. 
Contractors to H.M. Governments. 
Optical Works—HIGH BARNET, HERTS. 
Branches 42° FORREST ROAD, EDINBURGH. 
(184 GREAT PORTLAND STREET, LONDON, W. 
Sole Agents for Great Britain and 
Ireland (except London). 
SPENCER MICROSCOPES, 
MICROTOMES, &c. : 
I9I4 PRICE LIST 
Post free upon application to 
STANDLEY BELCHER & MASON, Ltd., 
63 Church St., Birmingham. 
{2 EASY ROW, BIRMINGHAM. 
Depots | 212 NOTRE DAME STREET WEST, MONTREAL. 
\78 SWANSTON STREET, MELBOURNE, AUSTRALIA. 
NOW 
READY. 
Printed by RicHarp CLay & Sons, LimiTEp, at Brunswick Street, Stamford Street, S.E., and published by MacMILLAN anpD Co., LIMITED, at 
St. Martin’s Street, London, W.C., and THE Macmitian Co., 66 Fifth Avenue, New York. —Tuurspay, February 19, 1914. 
Ditto in bronzed light meta} 
J. H. STEWARD, uw, 
sta intiniaie 
