Vol. 16. SEPTEMBER 1883. No. 99, 
Published the First Day of every Month.— Price 2s. Qd. 
THE 
LONDON, EDINBURGH, and DUBLIN 
PHILOSOPHICAL MAGAZINE, 
JUSTD 
JOURNAL OF SCIENCE. 
Being a Continuation of Tilloch's -Philosophical Magazine, 
Nicholson's 'Journal,'' and Thomson's 'Annals of Philosophy.' 
CONDUCTED BY 
SIB, ROBERT KANE, LL.D. F.R.S. M.R.I.A. F.O.S. 
SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. Ac. 
AND 
WILLIAM FRANCIS, Ph.D. F.L.S. F.R.A.S. F.C.S. 
; _ _^ v 
FIFTH SERIES. 
N° 99.— SEPTEMBER 1883. 
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