Vol. 28. SEPTEMBER 1889. No. 172. 



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



THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE, 



OFF IC / 

 AND i n t ; D r r v 



JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis '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.O.S. 

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



AND 



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



FIFTH SERIES. 



N° 172.— SEPTEMBER 1889. 



WITH FOUK PLATES. 



Illustrative of Mr. Chaeles Tomlinson's Paper on the Theory of Hail ? 

 and Mr. Tanakadate's on the Thermal Effect due to Reversals of 

 Magnetization in Soft Iron. 



LONDON: 



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