The next No. of this Journal tvill be published on the first of Nov. 





CONTENTS. 





4 



Art. XII. Notice of Dr. Hooker's Flora Antarctica ; by Prof. 

 Asa Gray, 



XIII. On the Quantitative Separation and Estimation of Phos- 

 phoric Acid ; by H. Rose, 



XIV. Abstract of an Article on the Conducting Powers of the 

 Metals at different temperatures, &c, by ML Edmond 



Becquerel, * - - - - -- 



XV. A Memoir of Charles Alexander Lesueur. Read before 



the American Philosophical Society, the 6th of April, 1849; 

 by George Ord, ........ 



XVI. On the Diurnal Variations in the Declination of the Mag- 

 netic Needle, and in the Intensities of the Horizontal and 



Vertical Magnetic Forces ; by Prof. William A. Norton, 



XVII. On the Method of determining the Geographical Longitude 



by Altitudes of the Moon ; by Prof. W. Chauvenet, 



XVIII. On the Electro-Chronograph ; by the inventor, John 

 Locke, -------.. 



XIX. On the Curve described by a Movable Pulley ; by Prof. 

 A. Secchi, --•--.-.. 



XX. Thoughts on Ancient Metallurgy and Mining in Brigantia 

 and other parts of Britain, suggested by a page of Pliny's 



Page. 



161 



181 



185 



189 



216 



226 



231 



252 



Natural History ; by John Phillips, Esq., F.E.S., F.G.S., 258 



scientific intelligence. 





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ft 



I 





Chemistry and Physics.— On Margaritinic Acid, by Louis Saalmueuer, 263 

 On some New Phenomena of Light and Actinism, by Mr. Hunt, 265.— On the 

 direct production of Heat by Magnetism, by W. R. Grove, Esq., 266 — Glo- 

 noine, 267.— On the Action of Alkalies and Acids upon Aldehyde, by H. Wei- 

 denbcsch, 268. — On an Organic Compound containing Arsenic, by Prof. W e- 

 ler; On Liquid Protoxyd of Nitrogen, by M Dumas, 2&K— On Anhydrous 

 Nitric Acid, by M. Deville : On the Composition of Stearic and Mirgaric 

 Acids, by Bieasra. Laurestt and Gerhardt, 270— On i prylone, by G, Gucx- 

 elbercir : Composition of Bone Earth, by Dr. W. Heintz: On the reaction 

 of Iron and Zinc with Anhydrous Sulphuric A J and with Sulpha***, by 

 A. d Hccreuse, 271.— Hvdrated Valerianate of Zinc : On the Passage of 

 Hydrogen gas through solid bodies, by M. Louvet: On Emulmne, by B- W- 

 B x ? 272. 



• > 



tfj 



iralogyund §d t. — On Chioritoid and Maaoni te, by J. D. Whitney* 

 Black Os i of Copper of I ke Superior, 273,— On Arkansite ; B tine 



(For rema? - of Contents, see third page of Cover.) 



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