A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. 1877; Vol. 72] 



THURSDAY, OCTOBER 19, 1905 



Price Sixpence 



Newspaper at the General Post Office.] 



[All Rights 



NEWTON 



& CO.'S 



LONG RANGE 

 ELECTRIC 

 LANTERN. 



Single Long-range Lantern, brass front with4j-in. condensers. and 

 extra large front lenses 3 in. in diameter. Complete with the "'New 

 Universal" Hand-feed Arc Lamp in case. £22. 



This Lantern is as efficient as any we can make for showing slidesinlar^e 

 halls where electric current is available. 



3 FLEET STREET, LONDON. 



Apparatus 



for the 



determination 



of the relative 



conductivity 



of thin layers 



of materials. 



LEES" & CHORLTONS 

 METHOD. 



Catalogue of Part II.. 

 SOUND, LIGHT & HE.Al 

 ____^^>__^«»^^^^M^ '""^^ **" application. 



t|[»lji|igijBiiiii iiiiiiiimiiiiniiwJI 



JOHN J. GRIFFIN & SONS, Ltd., 



20-26 SARDINIA ST., LINCOLN'S INN FIELDS, 

 LONDON, W.C. 



VERLAC VON CUSTAV FISCHER IN JENA. 



Sotben erschienen : 



Studien liber Hautelektrizitat und Hautmagnetismus 

 des Menschen. 



Nach eigenen Versuchen uml Beobachtungen. Von Dr. ERICH 

 HARNACK, Prof. d. Pharmakologie und physiol. Chemie z. 

 Halle. Mit 8 Figuren im Te.\t. Preis : i Mark 60 Pf. 



Leitfaden fur das Zoologische Praktikum. 



Atmungsapparat . 



Von Dr. med. ALBERT OPPEL, prakt. Arzt u. a. o. Professor. 

 Mit J64 Textabbildungen ". 4 lithogr. Tafeln. (Oppel, Lehrbuch 

 d. vergl. mikrosk, Analomie, Teil VI.) Preis : 24 Mark. 



Die Vererbungslehre in der Biologie. 



Von, Prof Dr. HEINRICH ERNST ZIEGLER. Mit o Figuren 

 und 2 Tafeln. Prew : ;■ Marl, 



NEGRETTI & ZAMBRA'S 



LONG RANGE BAROMETERS 



THE DIAGONAL BAROMETER.~ln thh 



ube 



ch lo 



tha 





I the 



cal column where in ordinary Mercurial Barometers the 

 iches would be marked, the tube is bent at an atiRle and 

 remaining 3 inche.s of the -icale — viz. ; 29, 30, and 31 — 

 ;xtended over a tube 36 inches long. 

 The mercury now moving diagonally instead of vertically, 

 avels over 12 inches of the tube to every inch on the ver- 



variation, even "01" to which the scale is 

 ,ly read without 

 magnifier. 



sUgh 

 divided, is a 

 the aid of 



Further Particulars and Prices of this and other Ioh^ 

 ran^e Barometers sent on application to the Manufacturers^ 



^^^3^ NEGRETTI & ZAMBRA, 



38 HOLBORN VIADUCT. 



Branches: 45 CORNIIILL, .am. iiz REGENT STREET, 

 LONDON. 



