CONTENTS. Vll 



XXX. Observations on American Species of the Genus Potamoge- 



Vage. 



ton, L. ; by Edward Tuckerman, A.M., - - - 347 



XXXI. On a New Table of the Pressure of Steam at various 

 Temperatures; by J. H. Alexander, Esq., ... 361 



XXXII. On the Dispersion of Light; by Lieut. E. B. Hunt, 364 



375 



XXXIII. Polarization of Galvanic Light; by Professor Chas. G. 



Page, M.D., 



XXXIV. Observations on some points in the Physical Geography 



of Oregon and Upper California ; by James D. Dana, - 376 



XXXV. On Biogen, or the so-called Albumen in the Ovarian 

 Egg, (from a letter of E. Desor to Prof. C. Vogt,) - - 395 



XXXVI. On some principles to be considered in Chemical Clas- 

 sifications ; by T. S. Hunt, 399 



XXXVII. New and Rare Plants, chiefly of the Carolinas ; by 

 M. A. Curtis, 



XXXVIII. On Gibbsite and Allophane, from Richmond, Mass. ; 

 by Prof. B. Silliman, Jr., 



XXXIX. Notice of a Novel Mode of Discharging a Leyden Bat- 



406 



411 



tery, with an explanation of its theory ; by J. H. Lane, 418 



XL. On the Action of Nitric Acid on Sebacic Acid ; by Abolph 

 Schliepek, - - - 



420 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — On the Crystalline Polarity of Bismuth and other bod- 

 ies, and on its relation to the Magnetic Form of Force, by Dr. Faraday, 425. 

 Method of obtaining crystalline combinations by Heat, and of reproducing 

 thereby various mineral species, by M. Ebelman : Researches upon Wax, by 

 Benjamin Collins Brodie, 427. — On Cbloropiorine, by Dr. John Sten- 

 house, PH.D., 429. — On Turpentine Camphor, by Dr. C. List, 430. — Im- 

 proved Method of preserving Milk, patented by F. H. F. Louis: On a New 

 Method for Amalgamating Zinc, by Prof. O. N. Stoddard, 431. — A Magneto- 

 Tangential Machine, by Prof. O. N. Stoddard, 432. 



Mineralogy and Geology. — Compact Diamond from Brazil, by M. Dlfrenoy : 

 Phosphorescence of the Diamond, by M. Reiss: Examination of three Dew 

 mineralogical Species, proposed by Prof. C. U. Shkpard, by J. D. Whitney, 

 433. — Chemical examination of some Minerals, by J. D. Whitney, 434. — On 

 the Constitution of some Silicates containing Carbonic Acid, Chlorine and Sul- 

 phuric Acid, by J. D. Whitm v, 435. —Mineral Coal on the Nile: Mineral 



Coal of Vancouver's Island, North West America: Gold of Africa, 436. — Ve- 

 suvius, 437. 



Zoology. — New localities of Infusoria in the Tertiary of Maryland, by Prof. J. W. 

 Bailey : The Oyster, 437, — New Discoveries of Bones of the Iguanodon, by 

 Gideon Algernon Manteix,438. — Additional Observations on the Osteology 

 of the Iguanodon and Hylaeosaurus, by Gideon Algernon Mantell, Esq., 

 LL.D., F.R.S., &c, 439,— Fossil Squalid* of the United States, by R. W. 

 Gibbes, M.D., 441. 



