vi CONTENTS. 
P 
XXXV., Fis ite Tron from North Carolina; by W. E. ae 
Hip 324 
XXXVI. — Result of Pendulum Experiments; by C. 8%. 
PORN ks d <n nitenicet ceamienetannd bry rerio teee tt 327 
SCIENTIFIC INTELLIGENCE. 
Physics.—Changes of volume produced by electricity, QUINCKE, 328.—Phenome- 
non of ees 329. 
Geology and Miner alogy.—Moving oe of Tuckerman Ravine, aap Mou 
tains, New Hampshire, W. H. PicKErRine, 329. poet, of the Iron and Gan 
per ba inise of Lake Superior, M. E. W apswortH, 330.—Pa iioouistcipiat notes, 
0. A TE, 332. =-Stratigraphical ge of antares Ohio, E. Orton: Occur- 
rence of hs in Group, : odont 
ptile: New species of aie I. Preswitchii Se ee for 1877 
act, Hari de la partie os Hautes-alpes Calcaires, E. RENEVIER, 334.—‘“‘ Fos- 
sil Glacier” of Yakutal Bay, Alaska, W. H. Datu: Optical examination of the 
red fidepat rt of the sa from Lyme, Conn., DeEsCLOIzZEAUX, 3 
any.—Native Flowers and Ferns of the United States, T. Gea 336.— 
ra for High Schools and Colleges, C. E. Bessey: Manual of Swedish Fae 
0. alent 337. 
Miscellaneous Scientific Intelligence.—Location of Lick enerety on Mount Ham- 
ae Califor, 338.—British Association, 339.—American set ec ri the 
Advancement of Science, 343.—Report of the Superin iden dent of the United 
States dann: Survey: Spodum = and the results of “* alteration _ Branch- 
ville, Ct., BRusH and Dana, 351.—Obituary.—Charles Thomas Jackson, 351: 
Samuel ternal Haldeman, 352. 
NUMBER CXIX. 
Art. sei Seca nade 1879-80 ; Oe C. A. 
vacuo 3b C. A. Youne, 358 
XXXIX.— — Geological Relations of the Limestone Belts of 
Westchester County, New York; by James D. Dana, 
(With Plate V),- - 359 
XL.— = Paleontolagienl and Embryological Development ; ‘by 
XLI.—Remarkable Marine Fauna occupying the outer banks 
off the southern coast of New England ; by A. E. Verritt, 390 
XLII. Revie of the Land Snails of the Palcneotn Era, 
with descriptions of New Species; by J. W. Dawson,.. 403 
XLIIL—Extension of the Carboniferous Formation in Massa- 
chusetts; by W. O. Crospy and G. H. Barron, ._.___- 416 
XLI —Discovery wi a new Planctoid, and observations on 
artwig’s Comet; by C. H. F. Prre ERS, 421 
XLV.—Discovery of oxide of Antimony i in extensive lodes 
in Sonora, Mexico; by E. T. Cox, -_-. ..-. .- 421 
ne the ‘ “Drag” of 
Water upon Water at Low ibetonbe! by SamMuEL 
Haveuton and J. Emerson Reynou 4 
