*^^.7i 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



No. 1690, Vol. 65] 



THURSDAY, MARCH 20, 1902. 



[Price Sixpence. 



Registered as a Newspaper at the General Post Office.! 



NEWTON & GO.'S GARDEN SUN-DIALS. 



Base-board is made to fold 

 so that the Lantern can be 

 packed into a box 18 i X 8^ 



X20i, 



JVOE'WTOJV AC CO., 



OPTICIANS TO HIS MAJESTY THE KING ANU GOVERNMENT, 

 3 PXEET STREET, LONDON. 



IHE ]S1E\V 



"LONDON" 



MICROSCOPE. 



REYNOLDS & BRANSON, Ltd., 



I'. STIMATES AN-D) IL. E E 13 S ■ [CATALOGUES FrEB. 



SPECTACLES 

 ELECTRIC LIGHT, INCANDESCENT GAS. 



And otlier Powerful Illuminants. 



With Eye -piece 1 inch, \ inch 



Object - glasses, in Mahogany 



Case, 



£5 12s. 6d. 



Double Nose-piece, 9/- extra. 



*]K Focus.sing Substage, 14/6 extra. 



R. & J. BECK, Ltd., 



J_^ 68 CORNHILL, 



1..01>^I>0]V. 



NEGRETTI & ZAMBRA'S 

 THERMOSCOPIC LENSES 



Protect the Eyes from Glare, and 



RENDKR THE LIGHT SOFT AND COOL. 



N. and Z.'s SPORTING SPECTACLES, close-fitting and having extra 

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



Illustrated Price Lists Free by Post to all parts of the World. 

 Motorists' and other Eve Protectors and Face Screens. 



N E G R E TTI AND ZA M B R A, 

 38 HOLBORN VIADUCT, E.G. 



BRANCHES : 45 CORNHILL; 122 REGENT STREET. 

 TWO GOLD MEDALS PARIS EXHIBITION 1900. 



