Vili CONTENTS. 
NUMBER CXXVI. 
Page 
Art. LIV.—Geological relations of the Limestone Belts of 
Westchester County, New York: Southern Westchester 
County and Northern New York Island; by J. D. Dana. 
WY URN tT ate A ee os ees Lk 2s 425 
LV.—Papers on Thermometry from the Winchester Observ- 
atory of Yale College; by L. Watpo,- wana SOS 
LVI.—Reduction of Air-pressure to Sea-level, , and the Deter- 
yan n of Elevations by the Barometer ; by H. A. “eh 
go ig (GP gh ic SEI NEL ON as eae SRT SU aoa ed ah ges 5: 
LVIL. men of Chromite in the interior ee a ose Mete- 
oric Iron from Cohahuila; by J. L. eens ca. S08 
LVI. Sg eis fe of Sound by Radiant aster: by A. G. 
LIX. ote ‘Solar Parallax as s deri ved from ‘the American. Pho- 
tographs of Ao Transit of Venus, 1874, December 8-9; 
by D. P. 
LX. poate Fishes from the Devonian Rocka of ‘Soaumense 
Bay, in the Province of Quebec; by J. F. Wurrnaves,_ 494 
HG SE ain-fal in Wallingford, Connecticut, between 1856 ; 
49 
SCIENTIFIC INTELLIGENCE. 
Chemistr Physics,—Direct Synthesis of Ammonia, JOHNSON, 498.— 
Ceyitain Beg their Coloring Matter, Srruve, 499.—Absorption Spectra of Color- 
9c Liquids, me SSELL and LaprarK, 500. —Supposed i Polarization of Sound, 
Geology and Natural History.—Zine-ore Deposits of Wiesloch in Baden, A 
Sst, 502.—Geological Map of the United States, , C. H. HrrcHcock, 505.— 
Repo BAILEY, 
ie 
MATTHEW and R. W. Exits: Text Book of Pa iestontha Mineralogy, Bi: BAUER- 
MANN, $06.-Genioulated Zircons, from Renfrew, Can K. HIDDEN: 
G. A begs 507.—Notes Algologiques, deuxiéme fascicule, E. Borner and G. 
THURET: Zoological affinities of Halysites, A. E. VERRILL, 5 
Miscellaneous Scientific Intelligence. —Elementa of Comet (a), 1881, Swift: National 
et of sat. 509.—Popular Lectures on Scientific Subjects, H. HELM 
The Constants of Nature, Part IV; ‘Atos weight determinations: @ 
H digest of the fi smc el published since 1814, G. F. BECKER, 510 
INDEX TO VoLUME XXI, stk 
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