CONTENTS. VU 



Pace 



Dr. Boase on the Composition and Origin of Porcelain 



Earth 348 



Mr. L. Thompson on Antimoniuretted Hydrogen, with some 



Remarks on Mr. Marsh's Test for Arsenic 353 



Mr. P. Cooper's Notice of a Theory of Molecular Action 355 



Mr. G. Bird on the Action of Electricity on Albumen 357 



M. Becquerel's Description and Use of an Electro-magnetic 



Balance, and of a Battery with invariable Currents 358 



Mr. H. F. Talbot's Experiment on the Interference of Light. . 364 

 Mr. Weaver on the Carboniferous Series of the States of 



New York and Pennsylvania 365 



Mr. Brooke on the Identity of two Minerals from Vesuvius 



named Biotine and Anorthite, and on a new Variety of 



Hemitrope Crystal of Quartz 368 



Mr. J. T. Graves on the Rev. J. G. Mac Vicar's Experiment on 



Vision 370 



Prof. J. F. W. Johnstone on the Composition of the right 



Rhombic Baryto-Calcite, the Bicalcareo-Carbonate of Baryta 



of Dr. Thomson 373 



Proceedings of the Royal Society 376 



.- Royal Irish Academy 382 



Geological Society 388 



Prof. Wheatstone on the Thermo-electric Spark, &c 414 



On the iEthereal Oil of Wine, by Liebig and Pelouze 417 



(Enanthic 7Ether 418 



Dr. R. D. Thomson on the Preparation of Boron 419 



Experiments on Camphor 420 



M. Lassaigne on a Compound of Albumen and Bichloride of 



Mercury 420 



CEnanthic Acid 422 



Meteorological Observations 423 



NUMBER LXIII.— JUNE. 



Prof. Schoenbein's Experiments on the peculiar Voltaic Con- 

 dition of Iron as excited by Peroxide of Lead; in a Letter 

 to Mr. Faraday 425 



Prof. Schoenbein's Further Experiments on the peculiar Vol- 

 taic Condition of Iron as excited by Peroxide of Lead .... 428 



Dr. R. J. Kane on the Protochloride and Terchloride of Iodine 430 



Dr. T. Andrews on the Thermo-electric Currents developed 

 between Metals and Fused Salts 433 



Mr. Westwood's Descriptions of some new British Species of 

 Hymenopterous Insects 440 



Mr. Alfred Essex on the Art of Painting in Enamel 442 



Dr. G. O. Rees on the Hydrate of Magnesia 454 



