Vill CONTENTS. 
NUMBER XVIIL. 
Arr. LL—Brief pomntenors | to p foblogy. from the Museum 
of Yale College. No. The Early Stages of the 
American. cates Silene Americanus Edwards) ; 
by S. L Smara,...-.-.----------------------------- 401 
R ks onthe N lat f Achromatic Objectives 
"for the Compound Microscope; by J. J. Woopwarp,.. 406 
LI1.—On a _ form of Lantern-Galvanometer; by ALFRED 
SF os ee ee er ee ee ee 414 
LIV. peseripitias of some new species of Primordial Fos- 
sila: by 8 W. Foun: 2.5 oo e222 2-2-2 ee 419 
LV. —Deseriptions of New Hees = — from the Cin- . 
cinnati Group of Ohio, by F. B. Mrrx,-------------- 423 
LVI.—On the Age of the pe ee Rocks of Lake 
Superior; by T. B. Brooxs and R. Pumpetty, 428 
LVIL. Biel Contributions to lees from the Museum of 
Yale College. No. XXII.—On Radiata from the Coast 
of 
.—On a Meteoric Iron buds found in El abe coun- 
Y California ; by CuaRrLEs v. 
a Solar ‘Halo; ; by Prof. Witi1am W. 7 OHNSON,-- 439 
LX._On? Molecular and Cosmical Physics; by W.A. Norton, 440 | 
LXI.—On the Structure of the Skull and Limbs in Mosasau- 
roid Reptiles, with descriptions of new Genera and 
Species; by O. C. Marsa. With four UME a an 448 : 
SCIENTIFIC INTELLIGENCE. 
pean and Physics.—On the Reversal of the Spectrum-lines of Metallic Va- . 
new ae powerful Thermo-Battery, 465.—Anomalous Production of © 
pors 
Ozone, ets i 
Geology and eh History. eSiegiee oo on the Taconic Controversy, BILLINGS, 
te —On the True —— Dana, 468,—The Dee aaeunieat of Limulus Polyphe- 
mus, PackaRD, Jr., 471.— a of Water by Leaves under certain cit- 
nsti PECK .—Coo (4 
Saran’ of Sota, British od yore, 474.—Fossil Flora of Great ‘Britain, 475. 
—The Garde — fe 
Astronomy. iy Po of Comets, 476.—New Planets: Discovery 
of a new coaes  aiok N, 4 
Miscellaneous Scientific th eee —On the cn odagrge — Petroleum in the Island 
of Santo Domingo, ge Terrestrial Magneti: of the sun’s rate of 
rotation, H@RNSTEIN, 481.—The Metric System nor Weights and Measures, BaR- 
NaRD: Die Naturgesetze der Fiitterung der landwirthschaftlichen Nitzthiere, 
bdo GoHREN, 482.— Pocket-book of Mechanics and ig gps NysTRoM, 
—An Eleme entary Manual of Chemistry, oo Popular Science 
Monthty, 484,— Obituary.— William Stimpson, 
neat, 
ng ii, p. 408, title, for J. P. Soutuwi read R. J. SouTHw 
ii (March, roto p- 198, line 22 ie top, for 80 by 110, prin ‘80 by 60. 
Suzbanp, Sr.,..2. ...-- 438 | 
