bl.8. JULY 1879. No. 46 



Published the First Day of every Month. — Price 2s. 6d. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



AjND 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloch's 'Philosophical Magazine? 

 Nicholson's 'Journal ,' and Thomson's 'Annals of Philosophy.' 



CONDUCTED BY 



SIR ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.C.S. 

 SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. &o, 



AND 



WILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.^ F.C.S. 



FIFTH SERIES. 



N° 46.— JULY 1879. 



WITH SIX PLATES. 



Illustrative of Dr. E. Aiterbach's Paper on the Passage of the Galvanic 

 Current through Iron, Frederick Guthrie's on the Fracture of Col- 

 loids, Professors Perry and Ayrton's on Earthquake Measurements, 

 Prof. D. E. Hughes's on an Induction-balance, and Mr. W. Chandler 

 Roberts's on the Examination of certain Alloys by the aid of the In- 

 duction-balance. 



^^^QS^SSQSm^QS^S^ "NDON: 



PRADV nr f^riK T CIS ' RED LI0N C0UET > fleet street, 



pnAnY Ur CONGRESS. } Dyer; Kent and Co.; Simpkin, Marshall and 



y A. and C. Black, and Thomas Clark, Edin- 

 Qh a p $ lodges, Foster, and Co., Dublin: — Putnam, 



Shelf J^ 5 



& lodges, 



S 



p-ED STATES OF AMERICA. $ 



