IV CONTENTS. 



Page 



Mr. H. J. Brooke on Poonahlite, a new Species of Mineral ; on 

 the Identity of Zeagonite and Phillipsite, &c. ; and other 



Mineralogical Notices 109 



Rev. H. Coddinjjton on the Theories of Achromatization, &c. 



in Reply to Dr. Gorinjj 112 



Mr. W. Sturgeon on the Thermo-Magnetism of Homogeneous 



Bodies; with illustrative Experiments 116 



Rev. P. Keith on the Conditions of Life 124; 



Mr. G. Innes on the Statement in the Nautical Almanac for 

 1833, of the Time of Beginning of the Solar Eclipse of the 

 16th of July in that Year ; together with the correct Times 



of that Eclipse, computed for Greenwich 1 35 



Errata in Schumacher's Ephemeris of the Distances of the 

 four Planets Venus, Mars, Jupiter, and Saturn, from the 

 Moon's Centre, &c., for 1833, published by the Admiralty. . 136 



Mr. S. Sharpe on the Theory of Differences 137 



Prof Airy's New Optical Experiments 141 



Proceedings of the Geological Society 143 



Zoological Society 145 



General Scientific Meeting at York — On the Rapid Flight of 



Insects 150 



Process for preparing Hydrocyanic Acid — Vanadium, a New 



Metal 151 



Magnesium 152 



M. Gay-Lussac on Oxalic Acid 153 



M. H. Braconnot on Gallic and Pyrogallic Acid 154 



Mr. J. Hemming's Analysis of Tennantite — New Patents .... 157 

 Occultations of Planets and Fixed Stars by the Moon, in August 

 1831. Computed for Greenwich, by T. Henderson, Esq.; 

 and circulated by the Astronomical Society — Meteorological 

 Observations 158 



NUMBER LVIL— SEPTEMBER. 



Mr. H.J. Brooke on Isomorphism 161 



Mr. J. J. Waterstone's Exposition of a New Dynamico-Chemical 

 Principle 170 



Mr. J. Blackwall's Examination of M. Virey's Observations on 

 Aeronautic Spiders, published in the Bulletin des Sciences 

 Naturelles 180 



Mr. H. J. Brooke on Mengite, a new Species of Mineral ; on the 

 Characters of AeschenJte ; on Sarcolite, as distinct from Anal- 

 cime and Gmelinite; with other Mineraiogical Notices 187 



Mr. J. F. Daniell on a New Register-Pyrometer, for Measuring 

 the Expansions of Solids, and determining the higher De- 

 grees of Temperature upon the common Thermometric 



Scale {continued) 191 



Rev. 



