June, 1915. 



KNOWLEDGE. 



(( 



FIELD MICROSCORY. 



WATSON'S 

 CLUB ' MICROSCOPE 



is the Ideal Instpument for Field Work. 



PORTABLE COMPACT 



Is made throughout with the 

 care and consideration of detail 

 which has made the name of 

 ' ' Watson " on a microscope a 

 guarantee of satisfaction. 



A few points to consider: — 



It packs into a leather sling 

 case 7J X 4i X 34 inches. 

 Accommodation in case for 

 2 eyepieces— 4 objectives — 

 condenser — forceps — dipping 

 tubes — nosepiece. 



A 3 " objective can be focussed 

 with ease. 



Every fitting is standard size. 



A Mechanical Stage can be 

 fitted. 



The instrument is adapted for 

 higu or low power work. 



The "Club" Microscope. 



All bearings sloucii and sprung. 



Price: Club Microscope as 6gured ne r\ f\ 



and described, in stiff leather case ... fcO w \J 



Send a'postcard for Section I of Catalogue No. 2, Full 

 details of this Stand will he found on page 94. Also 

 details of 32 other instruments at varying prices. 



ALL ARE BRITISH MADE. 



Collecting Apparatus. 



s 



, .*«TSONa£DNS 





Complete Outfits:— 



Silver-mounted best quality cane stick and inner extending 

 rod of hard cane with taper fitting ; — 2 bottles — metal clip — 

 metal net ring — cutting hook — spoon for mud — drag hook — 

 line — brass reel. Stick only. 12,6. Complete, £1 1 0. 

 Also Complete Outfits at 15/-, 17,6. 



Fvll specification of the above, also Collecting Tubes, 



Troughs, Botanical Presses, Geological .Apparatus, 



&c., in CATALOGUE So. 2, Section 2, gratis on 



request. 



WATSONS MICROSCOPIC OBJECTS. 



The most complete collection extant. Over 40.000 specimens, 



all specially selected, and guaranteed typical. Catalogue 



No. 3 gratis. 



No Microscopist should be without Watson's Catalogues. 



Send for your copy to-day and save money on your 



purchases. 



W. WATSON & SONS, LTD., 



Contractors to 1b. /1ft. ©ovemmcnts, 

 313 HIGH HOLBORN, LONDON, W.C. 



Hranches : 



16 Forrest Road, Edinburgh; 196 Great Portland Street, London, W. 



Dei UTS : 



2 Easy Row, ltirmiti(!hani ; 78 Swanslon Slreei, .Helliourne, Australia; 



212 Notre Ilame Street West, Montreal, Canada. 



Optical Works— HIGH BARNET, HERTS. ESTABLISHED 1837. 



The BECK BINOCULAR 



BECK BINOCULAR MICROSCOPE. 



No. 1031 P.S. 



Patent applied for) 



Not only an advance on 

 previous Binoculars, but 

 better tiian a .Monocular 

 with all powers. 



1. Resolution equal to that 



of a Monocular. 



2. Equal illumination in 



both eyes. 



3. Short tube length, mak- 



ing Microscope com- 

 pact. 



4. No special object- 



glasses or eyepieces 

 required. 



5. Standard angle of con- 



vergence. 



6. Stereoscopic vision. 



7. Binocular vision, saving 



eyestrain and giving 

 better results than 

 Monocular vision. 



S. Converted into a Mon- 

 ocular by a touch. 



/■"«// descriptive Booklet and Price List on application. 



R.&J.BEGK,L'^-68Gornhill,London,E.G, 



DENT'S CLOCKS 



WATCHES AND CHRONOMETERS 



FOR SCIENTIFIC L'SE. 



Sidereal op Mean Time Clocks for 

 Observatories, £21 and upwards. 



THREE GRAND PRIZES 

 AND ONE GOLD MEDAL 



FRANCO-BRITISH EXHIBITION. 



The only (Irand Prize awarded 

 to a British Firm for Watches, 

 Clocks and Chronometers. 



The only (irand Prize awarded 

 lor Astronomical keifulators. 

 Chronographs, and 5hip*s 

 Compasses. 



'DENT 



TRADE MARK 



61, STRAND, and 4, ROYAL EXCHANGE, LONDON. 



lelepttone .No. 61 Clly. 



CAUTION. 



The Proprietors of SCHWEITZER'S 

 " COCOATINA, ' " FAIRY COCOA," Ac, 



beg to inform their clients that SOSlz of their 

 products are manufactured in Germany ; that 

 they are a private ESGLISH COVPA.W man- 

 aged by a Board of E.XGLfSH DIRECTORS: and 

 that all shares are held by relatives and con- 

 nections by marriage of the late sole proprietor^ 

 Captain Thomas Edward Symons, R.\. 



