Vol. 30. OCTOBER 1890. No. 185. 



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



THE 

 LONDON, EDINBURGH, and DUBLIiN 



PHILOSOPHICAL MAGAZINE. 



AND 



JOURNAL OF SCIENCE. 



Being a Continuation of TillocKs 'Philosophical Magazine,' 

 Nicholson s 'Journal,' and Thomson s 'Annals of Philosophy, 1 



CONDUCTED BY 



SIR WILLIAM THOMSON, Knt. LL.D. F.R.S. Ac. 

 GEORGE FRANCIS FITZGERALD, M.A. F.R.S. 



AND 



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



FIFTH SERIES. 



N° 185.- OCTOBER 1890. 



>LAT] <^ 



Illustrative of Mr. Gael Baeus's Paper on the Isometrics of 



Matter. 



LONDON: 



PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. 



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 and by A. and C. Black, and T. and T. Clark, Edinburgh; Smith and Son, 

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