SCIENCE-GOSSIP. 



AMNH LIBRARY 



00" 64837 



BECK'S "IMPERIAL" MICROSCOPES. 



Every 



Adjustment 



for 



Critical 



Work. 



Pri 



rice 



£29 12 6 



m m 



.-^l-E 



R & J, BECK, Ltd., 68 Gornhill, EC. 



Twc minutes' walk from the Bank Station, Central Electric Railway. 



WATSON'S LATEST MICROSCOPES, APPARATUS, &c. 



NEW MICROSCOPE. 



WATSON'S 

 " HOLOS FRAM." 



A Nevtr Instrument on the 

 well-known "Fram" Model, 



But fitted with compound nibstage, -with 

 screws to centre and rackwork to focus, 

 and viechanical stage of besc quality. It 

 is the cheapest completely fitted Micro- 

 scope that is made, and, like all of 



WATSON'S SPINDLE 



TWO-SPEED 



FINE ADJUSTMENT 



Very 



Watson's Instruments, is of finest work- 

 manship. 



Stand only, with one Eyepiece, £8. 



The two speeds are obtained in a single screw 

 by the use of a milled head having its centre 

 extended in the form of a spindle one-sixth of its 

 size. The spindle is rotated for a quick, and the 

 milled for a slow movement. 



Can be fitted to almost any Microscope at small 

 cost — approximately 5,-. 



For full particula7-s see Watson's Supplemental 

 List of Microscopes. 



For full particulars see IVatson's Stipple 

 mental List of Microscopes. 



WATSON'S HOLOSGOPIC OBJECTIVES 

 WATSON'S HOLOSGOPIC EYEPIECES 

 WATSON'S HOLOSGOPIC 



OIL-IMMERSION CONDENSER 



WATSON'S UNIVERSAL CONDENSER }i;t';Zru^^rolTa7e^nl^^^^^^ 



should be used by all up-to-date 



- Microscopisls. They are the 



finest for practi al work. 



Every Microscopist should 



subscribe to 



WATSON'S 



Circulating Slides. 

 240 SPECIMENS 



^ , , ■ . On loan for £1 Is. 



Full particulars of the above, also of Watson <S~ Sons' Unique Microscopes, Objectives, and Appa 

 ratus arc contained in Illustrated Catalogue No. 2, post free on application to 



W. WATSON &. SONS, Opticians to H.M. Govt., 313 High Holborn, LONDON, W.C. 



Established 1837.] Branches-is rORREST RD., EDINBURGH ; 78 SWANSTON ST., MELBOURNE, AUSTRALIA. 



Sl'OTTISWOODE & Co. LTD., PRINTERS, NkW-STRFET SqUARE. LoNDON. 



INTERESTING 

 MICRO. OBJECTS. 



Foraminifera— group of about 

 12 species - Opaque ., 1/6 



Foraminifera from N. Atlan- 

 tic, S. Atlantic, Adriatic 

 Sea, and many other locali- 

 ties, each 1/- 



Malarial Parasite in Capil- 

 laries of Brain . . . . 4,'- 



Flower Seeds, in group, very 

 pretty 2/- 



Karyokinesis in root tissue 

 of Lily . . . . 3/- 



Group of Sponge Spicules 

 from St. Peter, Hungary.. 2 6 



Butterflies' Eggs, arranged in 

 group, opaque, each 5, 6 & 10 6 



WATSON'S 



Object Catalogue 



(No. 3) 



Is the most comprehensive . 

 in the world. Post free. 



