, y-z- 



WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



MAR 29 1913 



NEWTON & CO. 



OPTICIANS TO H. M. THE KING, 



Have just purchased an 

 extremely fine stock of 



CRYSTALS FOR 

 THE POLARISCOPE. 



Write or call for List, or a selection 

 : : will be sent on approval. : : 



72 WIGMORE STREET, LONDON, W. 



(LATE AT 3 FLEET STREET, E.C.) 



The Handle i| 

 London Model. ? 



This is a new model, in which 

 the limb is made so as to form 

 a convenient handle for lifting 

 the microscope. Otherwise it 

 is similar to the ordinary 

 London model. 

 No. 1325. Stand, in case, 

 £3 5 6 

 No. 1329. Stand, in ease, 

 with spiral focussing 



REYNOLDS & BRANSON, Ltd. 



" RYSTOS " OPTICAL BENCH 



For use with the Stroud «S Rendell Science Lantern. 



Optical Bench for lantern, one metre long, without fittings, £1 10 0. 

 Sliding tables, 4/6 each. Lens holders, 5/6. Adjustable slit, 4/9. 

 Screen holder. 4/- Standard candle holder, 1/- Circular table, 1/6. 



Screen with gauze, 3/6. Half-metre extension with foot, 12/6. 



The above can also be used without the lantern ns an ordinary optical 



bench, and any part can be supplied separately. 



Descriptive Circular of Accessory Apparatus for the 



" S. & R." lantern, post free. 



14 COMMERCIAL STREET, LEEDS. 



THE NATURALISTS 

 FIELD -GLASS. 



The " Folding Minim " 



s an ideal Binocular 

 Ready for use. 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. 



NEGRETTI 5- ZAMBRA 



Full description 

 and price list of 

 "PRISM 



BINOCULARS ■' 



sent post free. 



Holborn Viaduct, London, E.C. 

 City Branch : 45 Cornhill, E.C. 

 West End: 122 Regent St., W. 



Ready for placing in case, or pocket. 



of an ordinary ciga 



