vi CONTENTS OF VOL. XXVI. — THIRD SERIES. 



Page 

 Mr. Hopkins on the Mechanism of Glacial Motion. Fourth 



Letter 328 



Mr. Hopkins's Reply to Dr. Whewell's Remarks on Glacier 



Theories 334 



Notices respecting New Books 342 



Proceedings of the Royal Astronomical Society 358 



Recent Comets 361 



On Humopinic Acid, by M. Wohler 361 



Analysis of the Meteoric Iron of Grasse, by Le Due de Levynes 362 



On Cotarnina, by M. Wohler 362 



On Apophyllenic Acid, by M. Wohler 364 



Analysis of Hypersthene 365 



Protoxide of Tin and the Alkalies, by M. Fremy 365 



Meteorological Observations for February 1845 367 



Table 368 



NUMBER CLXXIV.— MAY. 



Mr. J. P. Joule on the Changes of Temperature produced by 



the Rarefaction and Condensation of Air 369 



Mr. J. Cockle's Outline of a New and General Mode of Trans- 

 forming and Resolving Algebraic Equations 383 



Dr. A. W. Hofmann on the Metamorphoses of Indigo. — Pro- 

 duction of Organic Bases which contain Chlorine and Bro- 

 mine 385 



Prof. Forbes's Reply to Mr. Hopkins on the Motion of Glaciers ; 



with Reasons for avoiding further controversy 404 



Dr. R. D. Thomson on the Digestion of Vegetable Albumen, 



Fat. and Starch (concluded) 418 



The Rev. J. Challis on the Necessity of Three Fundamental 

 Equations for the general analytical determination of the 



Motion of Fluids .' 425 



Dr. Whewell's Remarks on Mr. Hopkins's Reply to the pre- 

 vious Remarks on Glacier Theories . 431 



Mr. J. Bryce's, Jun., Notice of a Tertiary Deposit lately disco- 

 vered in the neighbourhood of Belfast 433 



Queries regarding Dr. Young's Optometer 436 



Mr. R. Phillips, Jun., on the State of Oxidation of Iron in Soils 437 

 Prof. Forbes's Reply to some Remarks of Prof. A. Leymerie on 



the Identification of certain Lower Greensand Fossils 442 



Proceedings of the Royal Society 447 



Geological Society 452 



Remarkable Discovery of Mastodon Bonss in New Jersey .... 453 



On Stannic Acid, by M. Fremy 456 



Metastannic Acid 457 



