CONTENTS. 



Page 



Proceedings of the Royal Society 320 



Geological Society 325 



Chemical Society 339 



Further Remarks on Fibre, by Dr. Martin Barry 344 



On the Total Eclipse of the Sun, July 7, 1842 346 



Decomposition of Bromate of Potash by Heat 350 



On the Light which appears during Crystallization, by H. Rose 350 



Meteorological Observations for February 1842 351 



Table 352 



NUMBER CXXXII.— MAY. 



Air. W. C. Redfield's Reply to the Objections and Strictures 

 of Dr. Hare, with reference to the Whirlwind Theory of 



Storms 353 



Mr. Earnshaw on the Motion of Luminous Waves in an Elastic 

 Medium, consisting of a system of detached particles, se- 

 parated by finite intervals 370 



The Rev. P. Kelland's Remarks on a paper by Mr. O'Brien re- 

 lative to the application of the Undulatory Theory to the Ex- 

 planation of Dispersion 373 



Prof. W. H. Miller on the Specific Gravity of Sulphuret of 



Nickel 378 



Baron J. von Wrede on the Velocity of Eropagation of Radiant 



Heat ; with remarks by S. M. Drach, Esq 379 



Prof. Bunsen on the Radical of the Cacodyl Series of Compounds 382 

 Mr. R. Warington on the employment of Chromic Acid as an 



Agent in Voltaic Arrangements 393 



Prof. Bunsen on a new Class of Cacodyl Compounds containing 



Platinum -395 



Dr. R. H. Brett on detecting minute quantities of Arsenic and 



Antimony 403 



Prof. De Morgan on Fernel's Measure of a Degree 408 



Mr. R. Templeton's Inquiry respecting a correction requisite 

 in the working of Dr. Olbers's method of determining the 



Elements of the Orbits of Comets 411 



Dr. J. Scherer's Abstract of Chemico-Physiological Researches 



{concluded) 412 



Proceedings of the Geological Society 418 



Royal Irish Academy 434 



On Gismondine, by M. Kobell 440 



Analysis of Thulite, by M. C. G. Gmelin 442 



Analysis of Poonahlite 443 



Analysis of Wasser- Glimmer, by M. Morin 443 



On Sodalite and Cancrinite 444 



Analysis of Haviyne, by M. F. Varrentrapp 445 



On the Products of the Action of Potash on Indigotin — Chry- 

 sanilic Acid 445 



