A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



NEWTON & GO.'s 



•NEW' 



Science Lanterns. 





The finest series of inexpensive 

 Science Lanterns ever produced 



Write for Illustrated Catalogue just published 



(Post Free), or call at Messrs. NEWTON'S 



Demonstration Rooms — 



72 Wigmore Street, London, W. 



BECK'S FOCOSTAT LENS 



(HISCOTT'S PATENT). 



This lens fits on to the handle 01 a 

 Mapping Pen or Needle, and when oni__ _ 

 (focostat). Those who have hitherto used a watc 

 glass or a lens on a stand will appreciate the ad\ 

 Being fixed on the instrument itself, it is always in focus'; as it 

 moves with the instrument. It is invaluable to the Botanist, 

 Kntomologist, Zoologist, and the Draughtsman. ^ ^ 

 For Botany and Dissecting, complete with Needle 5 6 



,, ,, ,, ., ., .. „ and two special 



Scalpels with fine pointed Blades 9 6 



,, Draughtsmen, complete with Mapping Pens 5 6 



R. & J. BECK, Ltd., 68 CORNHILL, LONDON, EX. 



SECOND-HAND 

 PRISM FIELD GLASSES 



ROSS, 

 ZEISS, 

 GOERZ, 



&c, 



Iii perfect 

 condition 

 at greatly 

 reduced 

 prices. 



ond-liand 

 Optical IVIi».i*t., 



CLARKSON'S 



338 HIGH HOLBORN, LONDON, W.C. 



(Opposite Cray's Inn Road.) 



Telescopes 



In our price-list of Telescopes will 

 be found illustrated and described 

 numerous patterns for Look-out 

 use. Astronomy, and many other 

 purposes. A copy of this list will 

 be sent post-free to any address. 



NEGRETTI & ZAMBRA 



Scientific Instrument Makers. 

 Holborn Viaduct, London, E.C. 

 City Branch : 45 Cornhill, E.C. 

 West End : 122 Regent St., W. 



