CONTENTS OF VOL. XXV. THIRD SERIES. V 



Pago 



Dr. J. Stenhouse on some of the Salts of Meconic and Komenic 



Acids ]92 



Dr. J. Stenhouse on the Reduction of the Salts of Peroxide of 



Iron by means of Vegetable Substances 199 



Dr. J. Stenhouse on the Hydrate of the Oil of Laurel Turpen- 

 tine 200 



Dr. J. Stenhouse on East Indian Grass Oil 201 



Dr. J. F. Hodges's Observations on the Pharmaceutical and 



Chemical Characters of the Peruvian Matico 202 



X. Y. on Euclid's Twelfth Axiom 207 



Mr. J. W. Stubbs on certain New Theorems relative to the 



Conic Sections 208 



Dr. E. Rigby's Observations on Waterspouts 210 



Proceedings of the Geological Society 212 



■ Royal Astronomical Society 224 



Mineralogical Notices, by J. E.Teschemacher, Esq.: — Glaube- 

 rite, brought from Tarapaca, Peru, by Mr. John H. Blake. — 

 Pyrrhite. — Bucholzite and Xenolite. — On the singular Cry- 

 stals of Galena, figured in Alger's and in Dana's Mineralogy. 

 — Pyrochlore.(Microlite.)— Pyrophyllite and Vermiculite 231-234 

 On the Preparation and Properties of certain Chlorates, by 



M. Alexander Waechter 235 



On the Properties and Composition of the Protoxide of Gold, by 



Mons. L. Figuier 237 



Parabolic Elements of the Comet discovered by M. Victor Mau- 



vais, July 7, 1844, as computed by himself 239 



Meteorological Observations for July 1844 239 



Table 240 



NUMBER CLXVI.- OCTOBER. 



Sir W. R. Hamilton on Quaternions ; or on a new System of 



Imaginaries in Algebra (continued) 241 



Prof. Daniell and Dr. Miller's Additional Researches on the 



Electrolysis of Secondary Compounds (concluded) 246 



Dr. R. Fresenius on an improved Method for the Detection and 



Quantitative Determination of Arsenic 255 



Mr. J. Middleton on Fluorine in Recent and Fossil Bones, and 



the sources from whence it is derived 260 



Dr. J. Stenhouse on the occurrence of Mannite in the Lami- 



naria saccharina and other Sea- weeds 262 



Prof. E. Wartmann's First Memoir on various Phjenomena of 



Induction 266 



Mr. T. S. Thomson's Addition to a former communication on 



the Diffusion of Gases . . . . , 282 



Dr. J, Stenhouse's Method of preparing Benzoic Acid 283 



