V 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Of Nature trusts the mind which builds for aye." — Wordsworth. 



No. 2266, Vol. 91 1 



THURSDAY, APRIL 3. 191 3 



Q nal f/l usevv 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.) 



[All Rights Reserved. 



LANTE 



ElbOVV PolariSCOpe, or illustrating the various phe- 

 nomena of polarized light, with polarizing glass plates, 

 prism and lenses, mounted in brass, with rack adjustment 

 to focus tithe, in case, complete, J3V 7s. 



NEWTON «SC OO. 



72 WIGMORE ST., LONDON, W. 



NEW 'LONDON' 

 MICROSCOPE. 



THE HANDLE MODEL WITH 

 LARGE BASE. 



FINISHED IN BLACK ENAMEL. 



This new model of the London Student's 



Microscope has an exlra large and heavy 



base, giving it great stability. 



It is on the Handle 

 Model and the illus- 

 tration shows its con- 

 venient pattern. 



>. 1326 Stand ...3 13 

 364A Eyepiece 5 

 802 V" Object 



Glass 12 



S04 !'' Object 

 Glass 1 10 



3g2A Double 

 Nosepiece 9 



6 9 



R.&J.BECK,Ud. 



68 CORNHIIL LONDON, E.C. 



EITZ 



MICROTOMES 



By the aid of experienced mechanicians and the 

 use of modern and specially designed machinery, 

 we are able to construct microtomes 01 the utmost 

 precision in a large variety of models, from those 

 used in class work, to those of the highest excell- 

 ence for research work. 



Illustrated Descriptive List post free. 



Microtome Knives, made from the finest 



Sheffield surgical steel, in various sizes. 

 Microtome Knives re=sharpened in the best 



possible manner at reasonable charges. 



18 BLOOMSBURY SQUARE, W.C. 



{A jew doors from the British Museum., 



THE NATURALISTS 

 FIELD-GLASS. 



The " Folding Minim " 

 is an ideal Binocular 

 for Nature Study. It 

 combines the keenest definition, extra 

 wide field, magnification of 5i, and ample 

 illumination ; yet is no larger than a cigar 

 case, and is easily carried in a pocket. 



Price, in pocket case, or leather, ling 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' 



sent post free 

 on request. 



Ready for placing in case, or pocket. 



