VI CONTENTS OF VOL. XXXVI. — THIRD SERIES. 



Page 

 Prof. Sir W. R. Hamilton on Quaternions ; or on a New Sy- 

 stem of Imaginaries in Algebra {continued) 305 



Proceedings of the Royal Astronomical Society 307 



Royal Institution 311 



Notice of a Meteor, by J. Wallis, Esq 318 



On a former Observation of M. Clement on the Spheroidal State 



of Fluids 319 



Analysis of a Granular Albite, by Prof. M. H. Boyd 319 



On a series of Insoluble Salts of Phosphoric Acid, by M. H. Rose 320 



On Insoluble Alkaline and Earthy double Arseniates, byM.H.Rose 323 



On the discovery of Platina in the Alps, by M. Gueymard. . . . 323 



Analysis of Tin from the Mines of Banca, by M. Mulder .... 324 



Analysis of the Mud of the Nile 325 



Panopticon of Science and Art 327 



Meteorological Observations for February 1850 327 



Table 328 



NUMBER CCXLIV.— MAY. 



Dr. LeConte's Observations on a remarkable Exudation of Ice 

 from the Stems of Vegetables, and on a singular Protrusion 

 of Icy Columns from certain kinds of Earth during frosty 



■weather 329 



The Rev. B. Bronwin on the Theory of the Tides {continued). . 343 

 Dr. Playfair on the Nitroprussides, a New Class of Salts {con- 

 cluded) 348 



Mr. Glaisher's Remarks on the Weather during the Quarter 



ending March 31, 1850 360 



Dr. Voelcker on the Watery Secretion of the Leaves and Stems 



of the Ice-plant {Mesembryanthemum crystallinum, L.) .... 377 

 Mr. W. Spottiswoode on the Quaternion Expressions of Copla- 



narity and Homoconicism 379 



Mr. J. Glaisher on the Meteor of November 5, 1849 381 



Mr. T, S. Davies on Geometry and Geometers. No. V 382 



Notices respecting New Books : — Mr. W. R. Birt's Hurricane 



Guide 394 



Proceedings of the Royal Irish Academy 395 



On Ozone, by M. Schonbein 398 



The first idea of the Electric Telegraph 401 



Action of Nascent Chlorine on Lactic Acid, by M. Staedeler. . 401 

 On the separation of certain Acids of the series C" H" O*, by M. 



J. Liebig 402 



On the Composition of the Precipitate formed in Soluble Cyanides 



by Subacetate of Lead, by M. E. Erlenmeyer 403 



Theory of Complementary Colours, by M. Maumene 403 



Analysis of the Waters of the Mediterranean, by M. Uziglio. . 404 

 On new Compounds of Ammonia with Ferrocyanide and Ferrid- 

 cyanide of Nickel, by M. A. Reynoso 406 



