Vol 20. JULY 1885. 



No. 122. 



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 TillocVs '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. &c. 



AND 



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



FIFTH SERIES. 



< 

 N° 122.— JULY 1885. 



WITH THREE PLATES. 



Illustrative of Prof. Olives Lodge's Paper on the Stream-Lines 

 of Moving Vortex-Rings. 



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