CONTENTS. 
Pag 
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 ett 
Alabama ; by Prof. G. Troost, - 
IX. On the Allotropism of Chlorine as Seiadctnil tithe the 
Theory of Substitutions ; - Prof. Jonn Wi.i1aM 
Draper, M.D., - - 
X. Bibliographical Notices aitmeailes in North Kine in 
the years 1841-42, with Geological Observations on the 
United States, Canada, and Nova Scotia; by Cartes 
Lyett, Esq., F. R. S., 368.—On the Liquefaction and 
Solidification of Bodies generally existing as Gases ; by 
Micuae, Farapay, 373.—On the Geological Constitu- 
tion of the Altai; by M. P. de Tcuinatcuerr, 378.— 
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 Gisss, 
384.—New Books received, 386. 
MiscrLLanizs.—On the Hypothesis of Electric Currents in the 
Nerves; by M. Marrevucci, 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. Warrineron: Detection 
of kinic acid; by Jonn Srennovuse, 391.—On the decom- 
position of Salts of Ammonia at the ordinary temperature ; 
by H. Bence Jones, M. D.: Styrole: Salicine ; by M. Prrta, 
392.—Composition of Fungi; by Dr. F. ScHtosspercer and 
Dr. O. Dorprine : Action of Animal Charcoal ; by R. 
RINGTON: Thomaite ; a new mineral species, 393,—ScHeEE- 
RER on Aventurine Feldspar: Spadaite, a new mineral; by 
von Kosett: Descriptions of Polycrase and Malacrone, 
two new minerals; by ScnerreR: R. Puituirs, Jr., on the 
state of Iron in Soils, 394.—Sillimanite : On the origin of 
Quartz and Metalliferous Veins ; by Prof. Gustav BiscHor, 
336 
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