vi 
CONTENTS. 
Of a mass of Meteoric Iron discovered in De Kalb Coun- 
ty, Tenn.; (3.) Of a mass discovered in Green County, 
Tenn.; (4.) Of a mass discovered in Walker County, 
Alabama ; by Prof. G.'TRoost, - - - - 
IX. On the Allotropism of Chlorine as connected with the 
Theory of Substitutions; by Prof. Jonn Witi1am 
Drarer, M. D., - - - - - - - 
X. Bibliographical Notices :—Travels in North America in 
the years 1841-42, with Geological Observations on the 
United States, Canada, and Nova Scotia; by CHarLes 
Lyett, Esq., F. R.S., 368.—On the Liquefaction and 
Solidification of Bodies generally existing as Gases ; by 
MicuaEL Farapay, 373.—On the Geological Constitu- 
tion of the Altai; by M. P. de Tcuinatcuerr, 378.— 
Page. 
336 
346 
Whitney’s Translation of Berzelius on the Blowpipe: ~ 
Fownes’ Chemistry for Students: Lieut. Wright’s Trea- 
tise on Mortars, 379.—Dissertation on a Natural System 
of Chemical Classification; by Otrver Wotcorr Gizss, 
384.—New Books received, 386. 
MiscELLANIEs.—On the Hypothesis of Electric Currents in the 
Nerves; by M. Marteucci, 387.—New Researches on An- 
imal Electricity ; on the Muscular Current, and on the Proper 
Current; by M. Marrevcci, 388.—Structure of Electro-pre- 
cipitated Metals; by Warren De ta Rue: Electric Sound: 
An account of Compact Aluminum, 390.—Superoxyd of 
Silver: The blue color of Gold Leaf viewed by transmitted 
light: Xanthine: A curious change in the composition of 
Bones taken from Guano; by R. Warrineton: Detection 
of kinic acid; by Jonn Srennouse, 391.—On the decom- 
position of Salts of Ammonia at the ordinary temperature ; 
by H. Bence Jones, M. D.: Styrole: Salicine; by M. Praia, 
392.—Composition of Fungi; by Dr. F. Scutosspercer and 
Dr. O. Dorrrine: Action of Animal Charcoal; by R. War- 
RINGTON: Thomaite ; a new mineral species, 393.—ScHEE- 
RER on Aventurine Feldspar: Spadaite, a new mineral; by 
von Kosett: Descriptions of Polycrase and Malacrone, 
two new minerals; by ScHEERER: R. Puixuips, Jr., on the 
state of Iron in Soils, 394.—Sillimanite: On the origin of 
Quartz and Metalliferous Veins; by Prof. Gustav BiscHor, 
