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vn, 
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CONTENTS OF VOLUME XXVII. 
NUMBER CLVIL 
Arr. 1 a 52 — of a warmer Climate upon Glaciers; by 
3 by 
I11.—New Device for me abe "Boxee! “by C.F. "BRACKETT, 20 
IV.—Some poole in Clinaalnery: A rejoinder to Mr. Croll; 
De Sis OR WOOME, Ob ei. CGh ey tC SU ek wher ie a 21 
Vy Bx Toe melee: the Solar Corona without an Eclipse; by 
QC a a Oe ee i sid 37 
VI _—Elliptic Elements of Comet 1882, 1; F. rh Soggy veaant 32 
VII.—The Minnesota Valley in the Tee Age: ; by W. Upwam, 34 
IIL. —The —— Dimorphism in the Genus Cnutaten: 
UR ekeng pap lea ys Sarat tall gn ta Selene ry arte Page gu kA al 42 
1X. —brolition ae the American Trotting Horse; by F. E. 
SU TOUS POs Ck aso es Cae ke 44 
ae eins of J scibed Structure; by G. K. Girpmer,.....-. 47 
XI,—A Theory of the Ea rthquakes of the Great Basin, with 
a practical application; by G. K. Givpert,._...---.--- 49 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics. Sar pe hang a ai Soe niet lage! 53.— Pres-. 
ence of Sulphurous oxide in the air of Lille, LapurEav, mic weight 
of Antimony, Bone ey Conaticatien ae Galician Patton t peti 55. 
—Preparation of cia VARENNE: derivatives of Benzi], Burton, 
56.—Relation betw he Sun’s spots and the Earth’ ra OLICH 
eory he Fypnaiad-Bleotrit machine, CLAUSIUS mye Galvanometer, 
GOARANT DE TROMELIN, 57.—Heat produced in Iron and Steel b ver 
Magnetization, J. TROWBRIDGE and W. N. Hitt, 58.—Properties of vite and 
Tce, re OQ. PETTERSSON, 62.—Hydrography of the Siberian Sea, by O. 
na ma Mineralogy.—Second Annual Report of the U. 8. Geological durtes: 
J. W. Powstt, 64.—Third Annual Report of the U.S. Geological Survey, J. W. 
PowELt, 66,—Geology of Lehigh and Northampton Counties, Pennsylvania, 69. 
—Pennsylvania Geological Survey: Contents of a Bone Cave in the Island of 
gui 
D. EAl-< 
IeEN: ‘Lenticular Hills,” C. H. Hrroncock, 72.—Probable occurrence of | 
Herderite in Maine, W. E. Hippen: Analyses of Brazilian yes bres : 
73.—Groddeckite, a new mineral of re Chabazite te group, ARZRUN —Min- 
eral Resources of the United States, A. WitiiaMs, Jr.: Lehrbuch hy Mineral. 
ogie, G, TSCHERMAK, 75 
Astronomy. e acabmneae upon the Comet Pons-Brooks made at the Observatory 
of Yale College, 0 . T. SHERMAN: Spectroscopic Observations of t Pon 
Brooks, N. p—E KonxKo xy, r 6.—Observations of the Great Comet of 1888 made 
at the U.S. Placa! Observatory, 7 é eu 
— Scientific Intelligenc poaetgh of the Superintendent of the U.S. 
Coast and Geodetic ery for 1882, 77.—Annals of Mathematics, pure and | 
mane O, Stone and W. M. iol "3a 
