. 
CONTENTS, vil 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Determination of Carbon dioxide in aS Air, Mar- 
oe oe Atomic Weight of Ytterbium, Niison, 427.—Atomic Weight t of 
um, : Cymene in Leton 4 KELBE, 428, mie Thanet of normal 
Ethyl. spat, Vauuians: ia tropine, LADENBURG: Carbonyl Hemoglobin, 
WEYL and Vi Poa .— Ch ands: ‘of wave length b movement of the 
source of li Meg “Lt Successive Transformations of the Photo- 
oe eats stp prolonged pent of light, M. J. JANSSEN: Change of the zero 
of a therm ial. —Electric Dinsliarge in rarefied 
i i, 
Hoorwee¢: Introduction to the Study of Chemical Reactions, P. E. DREcHSEL: 
Water Souisde for Sanitary purposes, E. FRANKLAND, 431. 
Geology and — History.—Geological action of the Humus acids, A 
JULIEN: Catalogue of Minerals “ Tables of sei 3 a ego he oy "Bulletin of 
the Nuttall Ornithological mo Life on the Seash ore, or A of our age 
and Bays H. Emerton, 432.—Natural History of the A oriotieaial Ant 
Texas, i. ‘a McCook, 433. 
Astronomy.—Photographs of the — sg in Orion, H. DkRaPER: Astronomical Ob- 
aie at Rochester, N. Y., 33. 
Miscellaneous Scientific Intelligence —Manual of Cattle-Feeding, H. P. AnmsBy, 434. 
» jecanead: to the Archzology of Missouri: Spectroscopic Notes by a 
re Young, 435.— Obituary.—Professor Benjamin Peirce, 435.—Wm. Lasse 
NUMBER CXX. 
P 
Art. XLVII.—Note on the Zodiacal Light; by H. C. se 
Lewis, (With Plate VI), - ..-.- 437 
XLVIII.—The early stages of Renilla ; by ER Wuson, 
(With Plate VID), 446 
XLIX.—Geological relations of the Limestone Belts of West- 
chester County, New York; by J. D. Dana, (With 
Er UmGON Y S00 BG EA a ee eee 450 
L.—Abstract of some Paleontological , studies of the Life 
History of Spirifer levis H.; by H. 8. Wimt1rams, -- ---- 456 
sndee to VOlGMmeS Xi-EE, oi. os as a a 
