iv H CONTENTS, 
ples of the Science, by CHARLES W. Exior and Frank H. Storer, 130.—On a 
mode > extracting the metals Molybdenum and Chromium; by J. Eneu Lovex- 
LIN, 131. 
embed and Geology.—A system of paras & Descriptive Mineralogy, com- 
pri — e most recent. discoveries, by J. D. Dana aided by G. J. Brus, 
182 —tThe Mining and Metallurgy of Gold x Silver, by J. ARTHUR PHILLIPS, 
—New Geological Maps and Chart: New borate oe Mine Hill, Franklin, 
call Co., New Jersey—Sussexite; by G. J. Brusu, 1 
Botany and Zoology.—The Variation of Animals and Plants under ee eae 
by Cuartes Darwix, 140.—A second critical notice of Alcyonari 
seum of Yale College; i A. E. VERRILL, 143.—Note on Bthindptsyltens and Ar- 
cheocyathus; wy F. B. M 
Astronomy.—Theoretical spegeric relating to the motions of the Heavenly 
Bodies revolving around the ages n accordance with the law of Universal Grav- 
itation, by James C. Wats on Astronomical and Meteorological Observa- 
tions made at the United Seles Naval Observatory wee the year 1865, 146- 
—Small Planets, 147. 
Miscellaneous Scientific Intelligence.—Petroleum Wells in Mexico, 147.—American 
Association for the Advancement of Science: British eee gen tai" 
—Anton Rosing, 148.—Julius Pliicker: Charles G. Page, 1 
cellancous Bibliography.—A treatise on Meteorology; with a collection of Me- 
teorological tables, by Exttas Loomis, 149.—The Butterflies of North America, 
by Wa. H. Epwarps: Observations on Polyzoa, Suborder omen Lae 
by ALtpHEUS Hyatt, 150.—The Workshop: Transactions of the 
tomological Society, Philadelphia, 151. 
Proceedings of Societies, ete., 151. 
NUMBER CXXXVII. 
‘ Bg 
Arr. XIV.—A new Theory of Vision; by Samugn Rowtey, 153 
XV.—Fundamental Principles of Molecular Physics; by 
. W. A. Norton, 167 
XV1I.—On Faraday as a Discoverer; by Joun Tynpatt,_.. 180 
XVI.—On Enargite from the Morning Star Mine, Califor- 
nia; by Epwarp W. Roor,-- 201 
XVIti.—Physical Observations on the Andes and the Ama- 
zons; by James OrToN, 203 
XIX.—Notes on the Caucasus; by Capt. F. von Koscu- 
KULL, 214 
XX.—On some points in the Geology of Vermont; by . 
Srerry Hunt, jag 2 
