CONTENTS OF VOLUME XVIIL 
—_—_—_++4——___ 
NUMBER CIIL : 
Page 
Art. IL—Contiibutions to Meteorology; by Ex1as Looms. i 
Eleventh paper. Wit Wh plates F'and Ho 2505. 1 
If.—Silurian Formation in Cen, Virginia; by J. L. Campse ELL, 16 
IIIl.—New form of Spectrometer, and on the distribution - the 
intensity of Light in the Spectrum; by J. W. Dra ER, 30 
VI.—Extinct Volcanoes about Lake Mono, and their ralion 
to the Glacial Drift; by J. LeConrx,.............__. 35 
V.—Mineral Locality in "Fairfield County. Connecticut ; by 
G. J. Brusn and E. 8. Dana. Third pepper ces i io. 45 
VI.—Note on the Progra! of Experiments for comparing a 
Wave-length with a Meter; by C. S. Petrcn, _.______. 51 
VIL—Recent Additions to the Marine oe al the Eastern 
Coast of North America; by A. E. Verrimt,._.__. ____ 2 
8 Per aie Sate 54 
IX.—Method of ‘Prevencug ‘the too rapid. Combustion of the 
Carbons in the Electric Lamp; by TE W Winky, oe: 55 
X.—Bernardinite, a new Mineral Resin ; by J. M. Stittman. 
XI.—Notice of a New Jurassic Mammal; by O. C. Marsu,-. 60 
XII. “ter the Hudson River Age of the "Taconic Schists; by 
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or 
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s D. Dan eve Gia oe ee nes Bt 61 
Pgs SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Action of Isomorphous salts in exciting the Crystalliza- 
. tion of Supersaturated Solutions of each other, Tompson: Ozone and the Silent 
Electric Discharge, 65.—Occlusion of Hydrogen by Copper, JoHNsON: Composi- 
of Charcoal from pure Cellulose, BERT “ S m derivativ: 
of Nitrogen trichloride, : Preparation of pure Cuprous c : - 
omposition of Wood, THo: . 67.—Dust Fi $s produced by Sound 
Waves, s . E EHM: Continuous Spec El 
Sparks, A ABT, 68.—A of Terre Magnetism, Perry and 
rimental researches in Pure, Applied and Physi stry, 
E. FRANKLAND, 69.—A Guide to the Qualitative and Quantitative Analysis of 
Urine, &c., Nrusa and Vi : es aoe to Hand- mical 
in EL 
gm aoebaee C. G. Wi ILLIAMS, ae on Hepa of the Vapors of Phospho- 
V. Mr (ee 
Geology and Natural History.—Die ae omit-Riffe von ef idtirol und Venetien, E. 
OJSISOVICS VON MossvAR, 71.—A Native gelatinous Silicate: Naturwissen- 
schaftliche Beitrage zur Kenntniss der Kaukasuslander auf Grund semer Sa 
melbeute, herausgegeben OQ. SCHNEIDER: Mémoire sur le Fer Natif du Greenland 
et sur la Dolerite qui le renferme, J. L. Surra, 72.—Jarosite (with gold): The 
cg Text book 4 of A. Gray, 73 .—Chronological History of Planis, C. PIcK- 
ERING, 7 
