vi CONTENTS. 
NUMBER CXT. 
ART. — —Berthelot’s Thermo-Chemistry ; by J. P. 
XXXUL- —tistory of some Pre-Cambrian Rocks in America 
and Kur y T. Srerry Hunt, - G 268 
XXXIV. ae mopais of the Cephalopoda of the Northeastern 
Coast of America; by A. E. Verrtiy ea 
XXXV.—Notices of Recent American Earthquakes ; : “by C. 
G. Rockwoon, Jr. outs 295 
XXXVI.—Observations on the “Height of Land and Sea 
Page. 
Breezes, Senge at Coney Island; by O. T. SuHerman, --- 300 
XXXVII.—New Method of Spectrum Observation ; by J. 
i IGN 2 alee awa ue 303 
XXXVI. ——Prekongation of Sonorous: sears acd means 
of a Revolving Lantern; by Henry Car ee 
XXXIX oe Compasidiea of Childrenite ; ag fod 
Pen 
he Oheertetion, on the Planet Lilaea; by C. H. F. Serpe 317 
XLI.—Efficiency of Edison’s Electric Light ; H. A. Rowra 
and @. F> Vane tay hs) i Si 
er a 
SCIENTIFIC INTELLIGENCE. 
Physics.—Photographs of Star Spectra, W. Huaeins, Eee Ce: rect measure of the 
work of Electrical —— ction, A. VON W ALTENHOFEN, —Mechanical Equiva- 
lent of Heat, Row te Dispersion Photometer, Pat and AYRTON, 319. 
Geology.—The ae me of the Evidence bearing upon the Question of the 
Ankity of Man, T. McK. HuGues, 319.—Age of the Brazilian Gneiss Series. 
ery of Ko: 
from the Hamilton and Genesee-Shale Divisions of the Devonian, in Canada 
and the A aimee States, G. J. Hype: Report on the Paleontological Field-work 
ar sar of 1877, C. A. WuiTE: Cretaceous Fossils of the Western States 
a ‘Terri 
Bis Werner: Revision of the Paleocrinoidea, C. WacusmMuTH and F. 
SPRINGER riptions of New Species of Crinoids from the Kaskaskia Group 
of the Sel oarhonifarona A. C. WETHERBY, 328. 
Botany sia —Soluble Matter of Soil retained by Vegetation: Seeds endure 
ee te Cold, C. DECANDOLLE and R. Prorgr: The Genus Ginkgo, 328.—Floral 
Development. of Helianthus annuus, W. H. Ginprest: Morphology of Vegetable 
Tissues, ILBREST: Aroidez: Maximilian, J. PeyritscH, 329.—Natural- 
ized Weeds and other Plants of South Australia, R. SchompurGK, 330.— 
Can 
indian Corn, ty L. SturrEevant: Death of General Munro, 331. —Crustacea 0 
Mexico and Central America, A. M. Epwa 332.—U. S. Commission of ap 
Fisheries: American Fisheries: a History of the Menhaden, G. B, Goo 
The Clinch Bug, C. THoMAs, 333. 
Miscellaneous Scienti tific Intelligence.—Vesuvius: The Study of Earthquakes in 
Silcerlénd. 334.—The “ignite of the Earth, . R. OLaRKE: Metallurgy, the 
py of extracting metals from their ores, J. Percy, 335.—An historical sketch 
Henry’s contribution to the Elee tro-magnetic Telegraph, W. B. TAYLOR: 
Bulletins of United States National Museum, 336.— Obituary.— WILLIAM 
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