T 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



To the solid ground , 



Ot Nature trusts the tnind which builds for aye." — WordswortB. 



No. 2268, Vol. 91] 



THURSDAY, APRIL 17. 191 3 



[Price Sixpence 



Newspaper at the General Post Office.; 



(All Rights keserved. 



NEWTON & Co/s 



NEW SERIES OF 



Kinematographs & Films 



FOR EDUCATIONAL PURPOSES. 



(For Sate or Hire.) 



There is undoubtedly a great future for the Kinemato- 

 graph in Schools and Coll;ges, but it has been difficult 

 up to the present to obtain good Apparatus and Films 

 on reasonable terms, and to change the Films from 



week to week as required. 

 Messrs. NEWTON & Co. have now prepared a com- 

 plete scheme for so doing, full details of which will 

 be sent on application. 



NEWTON 6 CO., 



Opticians to H.M. King George V. and the Government. 



72 Wigmore Street, London, W, 



(Late of 3 Fleet Street, E.C.) 



Telegrams : Established over 200 Years. Telephone . 



"Newtobar, Wesdo, London. " 2 , !g Mavlair. 



BECK'S FOCOSTAT LENS 



(HISCOTT'S PATENT). 



This lens fits 

 Mapping Pen or 

 (focostat). Those 

 glass or a lens , 

 Being fixed on 1 

 ith the 



Entomologist, Zc 

 For Botany and Dissecting, 



>logist, 1 



s always 

 invaluable to the 

 d the Draughtsiru 

 th Needle 



Scalpels with fine pointed Blades 

 Draughtsmen, complete with Mapping Pens 



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



9 6 

 5 6 



E.C. 



REYNOLDS & BRANSON, Ltd. 



' RYSTOS" OPEN STAGE LANTERN. 



GRAND PRIX. 



With Iron Body (suitable lor any illuminant) with side door and 

 brass sight holes, walnut base, meniscus condenser 4^ in. 

 diameter, objective of superior quality 2^ in. diameter, 6, 8, 

 9, or 12 in. focus, with rack and pinion. Complete in 



travelling case, but without burner £5 \2 



'Phcenix" Arc Lamp for above ... ... ... ... extra 2. 2 



For Optical Lanterns of other designs, see Catalogue, 

 224 pages, post free. 



14 Commercial Street, Leeds 



Ready /o 



THE NATURALIST'S 

 FIELD-GLASS. 



The " Folding Minim " 

 is an ideal Binocular 

 for Nature Study. It 

 combines the keenest definition, extra 

 wide field, magnification of 51, and ample 

 illumination ; yet is no larger than a cigar 

 case, and is easily carried in a pocket. 



Price, in pocket cose, or leather sling case. £7 10 



NEGRETTI 8- ZAMBRA 



Holborn Viaduct, London, E.C. 

 City Branch : 45 Cornhill, E.C. 

 West End: 122 Regent St., W. 



Illustrated 

 price lists of 

 'BINOCULARS' 



Ready for placing 



se, or pocket. 



