Vol. 16. JULY 1883. No. 9! 
Published the First Day of every Month. — Price 2s. Qd. 
THE 
LONDON, EDINBURGH, and DUBLIN 
PHILOSOPHICAL MAGAZINE, 
AND 
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.C.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. 
FIFTH SERIES. 
N° 97.— JULY 1883. 
WITH A PLATE. 
Illustrative of Mr. Walter Baily's Paper on the Crossing of Pays. 
LONDON: 
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