Vol.7. JANUARY 1879. No. 40, 



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 TillocKs 'Philosophical Magazine ,' 

 Hcholsons 'Journal/ and Thomson s 'Annals of Philosophy.'* 



CONDUCTED BY 



RT KANE, LL.D. F.R.S. M.R.LA. F.C.S. 

 jLIAM 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° 40.— JANUARY 1879. 



5 



WITH FOUR PLATES. 



Illustrative of Mr. W. Baily's Paper on Starch and Unannealed Glass 

 under the Polariscope. 



LONDON: 



PBXNTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET, 



Sold by Longmans, Green, Keader and Dyer ; Kent and Co. ; Simpkin, Marshall and 

 Co. ; and Whittaker and Co. ; — and by A. and C. Black, and Thomas Clark, Edin- 

 burgh ; Smith and Son, Glasgow : — Hodges, Foster, and Co., Dublin : — Putnam, 

 New York :— and Asher and Co., Berlin. 



