NOW READY, A NEW EDITION OF 



ILLUSTRATED CATALOGUE OF ^^ 



Microscopes^^^ectiYes, & Accessories 



I'^.iVnL''" ^"""f f"»y described all tl^Latest I.nprovements and Design'' of 

 i?^T„^??Si?^'™"''"'«' includins; their well-known VAN ■ff'pTrnp^ i 



Accessories, including the followint' — Kirms oi 



A SERIES OP NEW "PARACHROMATIC" OBJECTIVES '' 



.nH mT ^''f ''"."''" ^0 found to possess large apertures, to be of uniform nualitv 



AT A T-> • . „ 



Power. 



N.A. 

 0-34 

 028 



Price. 

 £12 6 

 £15 



•in 



1-20 N.A. 



Power. N.A. Price, 



i-in. - 0-68 - £15 



Hn - 0-87 - £1 10 



Homogeneous Immersion. 



£4 15 I 1/12-in. - 



N.A. 

 88 

 0-90 



1-25 N.A. 



Price. 

 £2 

 £2 5 



£5 



Watson and Sons 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 orlass can, therefore, be imme- 

 diately replaced without cementing. It is 

 constructed in aluminium. Price 15/- 



Watson and Son's 

 NEW "PARACHROMATIC SUBSTAGE CONDENSER, 10 N.A. 



This has an extremely large aple^w; 

 natic aperture, exceeding '90 N.A. * 

 power, f-in. ; mounted with diqii 

 phragm divided to indicate the N.Av 

 at wliich condenser is working 

 Revolving carrier for stops. Com 

 plete with stops for dark-grounc 

 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 



Frice-In German Silver Mount, pocket form 15/6 



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



-^^^ ^bo^e Catalogue will be forwarded post free on application. " ' ' 



MICROSCOPIC OBJECTS. 



^\atson and Sons hold a Stock of 40,000 Specimens, all of the highest class 



ZXL'^'fT^''^^^ the Finest Collection in rhf World. ' Full Classified L^t for 

 wai aea post tree 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. 



^"^fhf w'^ M^''^^ and other Medals at International Exhibitions, including 5 Hijrhest Awards at 

 the Worlds Fair, Chicago, 1893, 2 Gold Medals Paris Univerkl Exhibition, I889! etc etc 



