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CONTENTS . 
NUMBER XCVITII. 
Art, eh A Sketch of the ed of a in the United 
ar ae me ae of the Mississippi ee - - 
XIX. Contributions to Mineralogy; by F. A.GentH, - + 
XX. On some questions concerning the Coal formations of North 
America. Families, Genera and Species of Coal Plants of 
the United States; by Lo saictcapeiacail aaa from 
vol. xxxli, p. 205 
XXI. Abstract of a wisiastblagloit Fortra: Est: at Matin Ohio: 
lat. 39° 25’ N., and long. 4° 28’ W. from Washington City, 
for the year 1861 ; ae S. P. vicspaale ie ipieniesonh x 
annual Report 
XXII. On the Study of the Electric Spark by te aid of Photo- 
graphy; by Prof. Ocpen N. Roop, of Troy, N. Y. - - 
XXIII. On the Production of the Methyl Bases, and on the Pre- 
paration of Nitrate of Methyl; by M. Carey Lea, - : 
XXIV. Colored Derivatives of Naphthaline; by M. Carey Lea, 
XXV. Physiographical Sketch of that portion of the Rocky Moun- 
tain range, at the head waters of South Clear Creek, and 
east of Middle Park, 23l—with an enumeration (by Dr. 
Gray) of the plants collected in this met in the summer 
months of 1861; by C. C. Parry, M.D., : : 3 
XXVI. Investigations respecting the Pecans of Meteoric 
ings, as affected by the Earth; by ——. C. Twining, 
XXVL. Geographical Notices. No. XV a Ah 
Africa: Spekes Journey to Lake “ines 959 .—Pethe- 
rick’s Expedition to Gondokoro, 260.—Latest Intelligence 
from Dr. Livingstone, 262.—Lejean’s Expedition to Gon- 
dokoro: Roscher and von der Decken: The Polar Re- 
gions: The Polar Expedition of Dr. Hayes, 263.—Tor- 
. rell’s Polar Expedition: The North Atlantic Telegraph 
Explorations, 265.—Profiles of the deep seas, (with dia- 
grams), 267. 
SCIENTIFIC INTELLIGENCE. 
229 
244 
Physics.—Temperature of the Atlantic Ocean compared with that of the air from South- 
ampton to Havanna, in a letter from M, ANDRES Pory, 268.—Dove’s Photometer, 269, 
—On the specific heat of certain y gogo: Ree@navxt, 270. 
