C O NTE NTS. V 



cal Geography in its relation to the History of Mankind, by Prof. Arnold 

 Guvot, translated from the French, by C. C. Fei.ton: Systeme Silurien du 

 Centre de la Boheme, by Joachim Barrande : Third Annual Report of the 

 Board of Kegenls of the Smithsonian Institution, 158. — Manual of Mineralogy, 

 by J. Nicol, 159. 



List of Works, 151). 



Appendix. — Fossil Footmarks, I. Lea, 160. 



NUMBER XXIII. 



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 

 Metuls at different temperatures, &c, by M. 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. 



Page. 



161 



181 



185 



189 



netic Needle, and in the Intensities of the Horizontal and 

 Vertical Magnetic Forces; by Prof. William A. Norton, 216 



XVII. On the Method of determining the Geographical Longitude 



by Altitudes of the Moon ; by Prof. W. Chauvenet, - 226 



XVII I. 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 

 Natural History ; by Johx Phillips, Esq., F.R.S., F.G.S., 258 



231 



252 



scientific intelligence. 



Chemistry and Physics. — On Margaritinio Acid, by Louis Saalmueli.er, 2G3 

 On some New Phenomena of Light arid Actinism, by Mr. Hunt, 2(j~>.—On the 

 direct production of Heat by Magnetism, bv \V. R. Grove, Lsq., 26t> — Glo- 

 noine, 2(i7. — On the Action of Alkalies and Acids upon Aldehyde, by H. Wki- 

 dexbusch, 868. — On an Organic Compound containing Ai nie, by Prof. Woh- 

 ler: On Liquid Protoxyd of Nitrogen, by M. Dimas, 26').--On Anhydrous 

 Nitric A I, by M. Devii.le : On the Composition of Stearic and Margaric 

 Acids, by Messrs. Laukent and Gkrhardt, 270— On Caprvlune, by G. Guck- 

 elbkrger: Composition of Bone Earth, by Dr. W. Hkintz: On the reaction 

 of Iron and Zinc with Anhydrous Sulphuric Acid and with Sulphates, by 

 A. d'HcuREUSE, 271. — Hydrated Valerianate of Zinc: On the Passage of 

 Hvdrogen gas through solid bodies, by M. Louyet : On Emulsine, by B. VV. 

 Bull, 272. 



Mineralogy and Geolory.—On Chloritoid tad Mas on He, by J. D. Whitney, 272. 

 — Blank Oxyd of Copper «>f Lake Superior, 27:1— On Arkansite : Baierine : 

 Notices of American Minerals, by Prof. C U. Shepard, 274— On the exist- 

 ence of Mercury in the Tyrol, by M. H. Rose : Mud of the Nile, 275. 



