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ae CONTENTS. vil 
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Vil. Variation, or the alternate Acceleration and Retardation of 
a Pel in the different — of its orbit ; by James H. 
VI. Giiievations on the Eodene Ssmoation of the Haited States, 
with saat pete of species of Shells — in it; by 
a... © D,—(with two plates, 395 
IX. Notices of Freeh Water — &e. 5° OE Rockbridge County, 
Virginia; by T. A. Con 
X. On the detection of Spiralty. dotted, or + Sealanifona Diets, and 
aed Mi ee tissues in Anthracite Coal ; by Prof. J. W. 
407 
XI. oe ste 'Geolegival Age of sie White Mountain; by Prof. 
Henry D. Rocers and Prof. Witu1am B. Rocsrs,  - 411 
SCIENTIFIC INTELLIGENCE. 
Chemistry—On new Magnetic are a “ae the Magnetic Condition of all 
Matter, by Micnuart Farapay, F.R —Resear oe on the Relations of 
M. HE Adi ria ound from ib sat of soft iron, 
Seren by a galvanic current, 426.—Electric sreemtint of paper, b 
O. Dwieur, 427,—On a New Process for obtaining pure Chlorine Gas, 
oy Profs. R. E. Roarrs, ch W. B. Rocers, 428.—Radiant Heat: Milk of the 
ilk tree: og a Asbest s, 429.—Artificial Aventurine, by REMY and 
Cremanpat: Spec état ‘artificially produced : Bromide and Chloride of 
0. 
- Silver in ancient soi: 
| 
i 
Min and Geology.—On certain gmt hous Crystals of Quartz, by 
- W. Fox, 430 0.—Petrified Forest near Cairo, 433—Cuchullin Hills in Sk e: 
Gradual rise-of Newfoundland above t e sea: Cae Cave, Schoharie 
Geo air 438. Survey of Vern: Stigmaria, 435.—Pterodactyl in the ‘English 
foggy: -—On the Formation of Cells, by M. Costr, 436.—S shodiently oF by 
¥ 
M. Fiscner pe Watpuem : Thoracoceras, a new genus of the of Or- 
thoceratites, by M ISCHER D LDHE she wg etna 
characteristics, 440.—T wo species of Fossil Asterias in the Blue > pom of 
Cincinnati, by M G . G. AntHo 
i é nd W. P. 41.— 
Circulating fluid in the Planorbis imbricatus : Siliceous shields of dafieoris from 
Guano: Zoolo a asentshes s, 442. 
Astronomy.— The new er ss 443.—Biela’ : BP ee! 446.—The Bond Comet, 
447.—First Comet of ] 8.—Comet of 184 : Planet Saturn, 449. 
Miscellaneous Intelligence. Mite Printing : eaeat eee’ 449.—On_ the 
Bublicgraphy—Asnale of the Lyceum of Natural History, of New York: 
bs the American Philosophical Society, Philadelphia: American head. 
emy of Arts and Sciences, Boston: Bibliotheque Universelle, Geneva 
nf Me i 
pecies: Lepasour, Flora Rossica: B 
de PEspagne, 454.—Bota ay of oi! on” Vora Bontanique dans le Midi 
Recent —o 455. 
