CONTENTS. Vil 
NUMBER LXXXIIL. 
Art, XLIL —Introduction and Succession of Vertebrate Life ee 
in America ; y < SOARSH, no cee een 37 
XLIII.—Note on the Helderberg Formation of Bernardston, 
Massachusetts, and Vernon, Vermont; by J. ANA, . 379 
XLIV.—History of ocak Exploration in Devonshire, Eng- 
land; by NGEL 387 
XLYV.—Is the Existence of Geom rings i in the Early. Exogen- 
ous ce proof of ee Seasons? by Cuarues B. 
RRING 394 
XLVI. Bie Sipylite, : a new y Niobate, ‘from Amberst County, 
Virgie bed. Wi Matai ses na She ae ce 39 
#4 
XLVIL—Mean Motion of the Moon ; by Srwon Newcoms,.. 401 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics—Action of Saline solutions on Lead, Murr: New Method 
for the Synthesis of Aydrocarbons, FRiepEL and CrarTs, 411.-—-The Terpenes 
of Swedish Wood Tar, ATTERBERG: Amylene from Amyl Iodide, ELTEKOFF, 
412 f e- 
onions 416. ie rotatory Pola ries M. TL. Racin: <r 
——— Sulphide of Mantphatees ” ecabvbiarot es Alkaline a and reed 
carbona -M. Hatem et mm fro: 
in iron ores, M. G. Parr =i, 418.—Light, and C. BARNARD: 
Manual of Inorganic Chemistry, a bon Taoaee: System of. Yolumettio Analysis, 
by Dr. Emil Fleischer, M. M. P. M 
Geology and Mineralogy. ealanaed a asia Survey of the Territories, 
F YDEN, 420.—Fifth Annual Report of the Geological and Natural His- 
ta, N. H. WINCcHE 22.—Geological 
tory Survey of Minneso ‘ LL, 422 Record for 1875, 
tice of Heterolite: a new eral Species, 
On some Tellurium and Vanadium Mine . A. Genta, 423. 
: ad 8, Mine 
Mittheilungen, G. vom Rata: Elemente der Mineralogie, (’ F. Naumann, 424. 
Botany Zoology. oo iy aioe ~— Cephalopod on ha? coast of 
Rewtcandiet A. E. Verriut, 425.—The Antelope and Deer of America, J. D. 
Eaton: Life Histories of the Birds of ins Pennsylvania, T. ‘G. pee (9 4 
he scum tH R. Levckart and H. Nirscue: Bulletin of the U. S. 
ar . Sr 
i. rbore 
ah ar land J. G. BAKER: Native “ Artichokes ” 428.—-Necrological, 429. 
Astronomy. —Discovery of a New Planet, 0. H. i teen 429.—Comets in nine 
Observations and Orbit of ioaien ents 
Miscellaneous Scientific In nee.—Davenport Academy of Natural 5 Sciences, 430. 
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ARREN, 43 
Leverrier, Joba G. Anthony, Benjamin Hallowell, a2. 
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