606. /:l 



A WtPKLY ILLUSTR\T1'D JOLRNXL Ol SCIENCE. 



" To the solid ground 

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



No. 1654, Vol. 64] 



Registered as a Newspaper at' the General Post Office.] 



THURSDAY," JULY 11, 1901. 



[Price Sixpence. 



[All Rights are Reserved. 



INTIDXJCTIOIir COXIL-S. 



APPS' PATENTED INDUCTION COILS are now manufactured 

 concurrently by 



IV e: "W -r o !«■ sc c o . , 



Opticians, &c., to H.M. the King, 



3 rLEET sMntEET, LortfiaoBa". 



NEW PHYSICAL LABORATORY TABLES. 



COMPLETE SETS OF APPARATUS FOR RONTGEN "X" RAYS. 



The Set with lo-in. Spark Coil is being used in many hospit.i 

 for I he Cure of Lupus. 



ILLUSTRATED CATALOGUE POST FREE. 



THK NEW 



"LONDON' 



MICROSCOPE. 



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, 



REYNOLDS & BRANSON, Ltd., 



Manufacturers of Laboratory Fittings and every description 



of Scientific Apparatus. 

 Estimates and] 1. E E ID S. [Catalogues Free. 



i^EGitETTi vac ^ja.]vt:Bi«.A.'s 



NEW PATTERN COMBINED 



BARO-THERMOGRAPH. 



The above inslrumem .ombiii.;^ in on; .ipparatus the Recording Baro- 

 meter and Recording Thermomet<:r, giving thus on one and the^same chart 

 continuous records of the atmospheric pressure and temperature for seven 



Itliiitratcd t^ 



'sis of Si 



cuts free l-y f est to all fa 



NEGRETTI & ZAWIBRA, 



38 HOLBORN VIADUCT, E.G. 



Branches : 4:; CORXHILL, and 122 REGENT STREET. 

 AWARDED two" GOLD MEDALS PARIS EXHIBITION 1900 



