S(^S.^'u 



A WEEKLY 11.1 I -IR'ATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Of Nature trusts the mind which builds fjr ajY."— WoRDSWORl H. 



No. 1670, Vol. 64] 



THURSDAY, OCTOBER 31, 1901. 



[Price Sixpenci-;. 



Registered as a Newspaper at the General Post- Office.! 



NEWTON & CO.'S 



PATENT 



"DEMONSTRATOR'S" LANTERN, 



1 The most simple 



and efficient 



Single Lantern 



jet constructed 



for general 



J scientific work. 



I THIS SEASON'S 

 ' J CATALOGUE OF 

 SLIDES, &c . 

 POST FREE 



FOR LIMELIGHT OR ELECTRIC. 



With Prism for Erecting, 

 and for Vertical Projection. 



Pkice £10 10s. 



3 FLEET ST., 

 LONDON. 



, Chemical and Scienttic Instn 



Government and Science 



LADCRATORY FUKN!«HERS and 



[All Rights are Reserved. 



:BR..A.3SrSO^J', Ltd , 



mient Makers to the ladianf,.,-,^ 

 and Art Department. 



MANUFACTURING CHEMISTS. 



COMlilNED CHIlMICAL AND 

 above, as supplied to National Phys 

 fm Gas, Water 

 Catalogue of Chemical and Physh 



14 COMMERCIAL 



PHYSICAL BENCH, illustrated 

 ical Laboratory, Teddington, fitted 

 and Electricity. _ 



:at Apf'aratus, 350 //, ««</ 1200 



on application. • * 



;gs to suit all nf<,iuire.ments. 



STREET. LEEDS. 



%, THE NEVV^ 



* "LONDON" 



p\\ MICROSCOPE. 



SPECTAC LES 

 ELECTRIC LIGHT, INCANDESCENT GAS, 



And othp 



\ m i n a n t s . 



With Eye -piece | inch, \ inch 



Object - glasses, in Mahogany 



Case, 



£5 12s. 6d. 



Double Nose-piece, 9/- extra. 

 Focussing Substage, 14;6 extra. 



R. & J. BECK, Ltd., 



68 cornhill, 

 x^o:n^i3o:n^. 



NEGRETTI & ZAMBRA'S 

 THERMOSCOPIC LENSES 



Prolecl llie Eyes f.oni Glare, and 



RENDER THE LIGHT SOFT AND COOL. 



N. and Z.'s SPORTING SPECT.ACLES, close-fitting and having e.vlra 

 large lenses, are the best for Shooting, Billiards, &c. 



lUnstratcd Price Lists 0/ Optical and Meteorological Inslruments, 

 Free by Post to all parts c/ the World. 



N E G R E TTI and ZAM BRA, 

 38 HOLBORN VIADUCT, E.G. 



