NOW READY, A NEW EDITION OF 



^W. "WJ^TSOIIT & SOJST'S 

 ILLUSTRATED CATALOGUE OF 



Microscopes, Objectives, & Accessories. 



IN it will be found fully described all the Latest Improvements and Designs of 

 the Watson Instruments, including their well-known VAN HETJRCK and 

 EDINBURGH STUDENTS' MICROSCOPES; also, many new kinds of 



Accessories, including the following : — 



A SERIES OF NEW "PAR ACHROMATIC" OBJECTIVES. 



These Lenses will be found to possess large apertures, to be of uniform quality, 

 and to be as low in price as any Objectives in the market. They are constructed 

 almost entirely of Jena Glass. The following are selected from the series •— 



I 



Power. N.A. 



A-in. - 0-34 



l-in. - 28 



i-in 



Price. 

 £12 6 

 £15 



1-20 N.A. 



Power. N.A. Price. 



■in. - 0-68 -£150 



- 0-87 - £1 10 



Homogeneous Immersion. 



£4 15 I 1/12-in. - 



1 



Power, 

 l-in. 



1/9-in. 



N.A. 

 88 

 90 



1-25 N.A. 



Price. 

 £2 

 £2 5 



£5 



Watson and Son's THE "ROUSSELET" COMPRESSOR. 



This is an improved form of this well- 

 known Compressor, in which the cover- 

 glass is fixed by means of two small screws. 

 A broken glass can, therefore, be imme- 

 diately replaced without cementing. It is 

 constructed in aluminium. Price 15/- 



Watson and Son's 

 NEW "PARACHROMATIC ' SUBSTAGE CONDENSER, I'D N.A. 



This has an extremely large apla- 

 natic aperture, exceeding "90 N.A. ; 

 power, f-in. ; mounted with dia- 

 phragm divided to indicate the N.A. 

 at which condenser is working. 

 Revolving carrier for stops. Com- 

 plete with stops for dark-ground 

 and oblique illumination, £3 15s. 



Gifford's *' P" Live Screen. 4/6. 



APLANATIC MAGNIFIERS. 



In addition to their regular Series, Watson and Sons are making 



Mr. E. M. NELSONS NEW FORM, magnifying 15 diameters, having 



great working distance and large aperture. 



It is believed to be unequalled by any similar lens for working qualities. 

 Price— In German Silver Mount, pocket form ... ... 15/6. 



For Dissecting, in wooden box ... ... ... 14/6. 



The above Catalogue will be forwarded post free on application. 



MICROSCOPIC OBJECTS. 



Watson and Sons hold a Stock of 40,000 Specimens, all of the highest class, 

 forming undoubtedly the Finest Collection in the World. Full Classified List for- 

 warded post free on application to 



W. WATSON & SONS, 313 High Holborn, London, W.C; 

 and 78 Swanston St., Melbourne, Australia. 



Opticians to'H. M. Government. Established 1837. 



Awarded 33 Gold and other Medah at International Exhibitions, including 5 Highest Awards at 

 the World's Fair, Chicago, 1893, 2 Gold Medals Paris Universal E.thibition, 1889, etc. etc. 



