Vol. 22. SEPTEMBER 1886. No. 136 



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



THE 

 LONDON, . EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE. 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of TillocKs c Philosophical Magazine,' 1 

 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. &c. 



AND 



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



FIFTH SERIES. 



N° 136.— SEPTEMBER 1886. 



PRINTED BY TAYLOR AMD FBANCIS, BED LION COURT, FLEET i 



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