May 4, [905J 



NA TURE 



For Sale, Pritchard's History of Infusoria, 



4th Edition, 1S61, cloth. Quarterly Journal Microscopical Science and 

 •l■^all^actions of the Microscopical Society 1S63, 1866, 1867. Particulars 

 from J. E. Arnett, I'he Library, Tenby. 



' Nature " to Sell, i6 volumes. Volume 54 



TYPE-WRITING UNDERTAKEN BY 



HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN- 

 TIKIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher 

 Local, thorough acquaintance with Modern Languages). Research, 

 Revision, Translation. Scale of charges on application. The Cam- 

 bridge Type-writing Agency, ro Duke Street, Adelphi, W.C. 



Fur ordinary work 

 this i-. the finest in- 

 strument obtainable ; 

 it can be used either 

 in the hand or on :, 

 stand. It is fitted 

 with an accurately 

 speeded roller blind 

 shutter, brilliant view 

 finders, rising and 

 cross fronts and three 

 double dark slides of 

 improved design. 

 Also an .iccurately 

 engraved focussing 

 scale. Price without 

 lens but as above, £5. 

 Any make of lens can 

 be fitted 



for 



A. KERSHAW, DORRINGTON ST., LEEDS. 



lid STROUD AND RENDELL 



ARMBRECHT'S 



Specialities. 



Radium Brom. in 5 mg, Tubes 



-Tor CANCER CURE. 



Calcium Metal, 1 6 per oz. r'2Tr"'"} 



Lithium Metal (Chem, pure) 1 gram, tubes. .. s 



Ru bidium 



Barium 



Beryllium 



Strontium 



Tellurium 



Uranium 



Above and the rest of the Rare Elements 

 be immediately supplied from stock. 



ARMBRECHT, NELSON & CO., 



71 & 73 DUKE ST., GROSVENOR SQ., LONDON, W. 



4^ND -Pi»/A \ ST. UK IS - I'.t04. 

 And other High Awards. 





HEELE'S NEW^ SF>EC'rJROGRAI>H: 



of uriginal Conslruclioti, equipped with < )ptical parts tiiade ftotn the New ULTRA-VIOLET-GLASS, for Special Ke^eatches 



on the Ultra-violet. Length of .Spectri.tn on plate l6 cm. Also, similar Cunst.uct.on, ol so.newhat smaller D.mensions, for use 



in Technical Institutes, with three piisms. Length of Spectrum on plaie S cm. Prices cm application. A large Speclrog.aph 



of this kind can be seen and tested at my Showrooms by appointment. 



PETER HEELE, 115 High Holborn, London, w.C.,'"'^'^"'^^?^ *5'™"°"''=^' '''^'^?"=^' '^'^?'?"?^' 



INSTRUMENTS TO SPECIAL DESIUNS A SPECIALITV. 



and other Instruments, and every kind of 

 Polarimeter and Spectroscope. 



