Vol. 28. AUGUST 1889. No. 171 



Published the First Day of every Month. — Price 2*. Qd. 



THE 

 LONDON, EDINBURGH, and DUBLIN 



PIJft^SOPHICAL MAGAZINE, 



^JOURNAL OF SCIENCE. 



Being a Continuation of Tilloclis 'Philosophical Magazine' 

 Nicholson's ' Journal f 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. &o. 



AND 



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



FIFTH SERIES. 



N° 171.— AUGUST 1889. 



WITH THEEE PLATES. 



Illustrative of Prof. R. J. Anderson's Paper on an Apparatus for Illus- 

 trating Crystal Forms : Dr. H. H. Hoffert's on Intermittent Light- 

 ning-Flashes ; and Mr. J. T. Bottomley's on Expansion with Rise 

 of Temperature of Wires under Pulling Stress. 



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