vill CONTENTS. 
NUMBER CL. 
Arr. XL.—Nature of the greutiete in the St. Peters and 
Potsdam Sandstones in Wisconsin; by R. D. Irvine, .. 401 
XLI.—Existence of a deposit in TWonbeustern Montana and 
Northwestern Dakota that is py Poiana with 
the Green River Group; by ©.a. W atrey, : 22.0) 12S 
New Percide from Dakota; E D. ‘Goss, side Jae 414 
XLII.—Concretions in Meteoric Irons ; sD J.'ds SMrrn, jae: Sie 
XLITI.—Mineral Vein formation in progress at Steamboat 
rings and Sulphur Bank; by Josrerpn LeConre,. -- -- 424 
XLV Observations of the Transit of Venus, Dee 6th, 
1882; by O. H. Lanprers, - goa oe Pueee be 
XLV.—Fauna found at Lime Creek, Towa; by S. Cat LVIN, _- 432 
XLVI.—Stratified Drift in Delaware ; by F. D. CuEstER,.. 436 
XLVI oe discharge of the flooded Connecticut ; ‘by 
J. Bosshe ie ls, Gt posto eed) a iad 440 
XLVI. he eriments made to determine the variations in 
length of certain gil by R. 8. Nias pwarpD, E. 8 
R. 
Wuereer, A. aot Wi. Vnee se 
XLIX. sBepiaitica a new elas sme fons Satuanes Conn. ; 
by G. J. Brusu and 8. L. AA 45 1 8 eae maser emg oyred ke 459 
SCIENTIFIC INTELLIGENCE. 
Chenteiry and Physics—Numerical estimate of the rigidity of the Barth, G. H. 
—s 464 _Ripple-marks, 467.—Direct vision Spectroscope of great disper- 
: Transmission of power by electricity: Radiation of rock-salt at different 
roi rs C. Baur, 469.—Application of Organic acids to the examination 
of sasestomnis H. ©. Botron, 470. 
. EB. Hat, a eS ae of the Triassic traps and 
sandstones of the Eastern United States, W. M. Davis, 474. et voree phenomena 
of Long Island, J. Brysen: Relations of the Felsyte to e Conglomerate on 
Central Avenue, Milton, Mass., M. E. big sola 47 ahr: ca fat W. 
O. Crossy : Origin of the Crystalline a Ore —Overturn folds in the Alps, 
477.—The Dimetian, Arvonian and idian y karat Erect tr oo 
Animal remains in Nova Scotia, J. W. Daw he Letheea Geologicn, . RoEM 
sae genet be J.D. Dana: Jeremeieffte, Damour, 478.—Pic 0-epidote, Demat 
DESCLOIZEAUX: Text-book of Mineralogy, HE. 8. Dana, 
om and Zoology. Bem then p des K. Seay aes Gartens ue ae Botanischen 
Museums 8 zu Berlin, —Flora of the Southern United States, 480.—Genera 
W. H. Moate: Synopsis of the Fishes of ao America, ‘Saueaie aad 
Giizert, 481.—Atlantic Right Whales, J. B. Houprr, 
Astronomy.—Draper Astronomical Medal, 482. 
_ Inpex to Vouume XXV, 483. 
i 
rs eh 
ay ae ae le 
