CONTENTS or VOL. XII. FOURTH SERIES. VU 



Page 

 Prof. Challis on the Transmutation of Rays of Light ; with a 

 Reply to the " Remarks " of Professor Stokes in the Decem- 

 ber Number 521 



Prof. Magnus on the AUotropic Conditions of Sulphur 526 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 531 



Proceedings of the Royal Society 539 



Note on the new Zeolite from Skye, analysed by Mallet, by 



Dr. Heddle 552 



Sir W. Snow Harris on Riess's Law of Electrical Heat 553 



Index 555 



ERRATA IN VOL XI. 



Page 157, line 5, /or half the side read the side. 



— 159, — 24, /or 2,000,000 read 5200 xlO«; and /or 8,200,000 



read2\mQxW. 



— ib. — 30, for 10 tons read 53,600 X 10^ tons ; and /or 42 tons ! 



reat? 874,000x106 tons! 



ERRATA IN VOL XII. 



Page 394, line 19, /or property read quality. 



— 395, — 7 fi'ora bottom, for a given result read given a result. 



— 396, — 14 from bottom, /or that read steel. 



