CONTENTS OF VOLUME VIII. 
NUMBER XLUL 
Arr. I.—Results derived from an examination of the United 
St a Rib ve Maps for 1872 and 1873; by Exias 
Loo With plates I and II, 1 
1 ae aon of Photogr: aphic Dry-Plates by Daylight, 
by oe and re-sensitizing the silver compounds ; 
Page 
mee Te Sh as So ee 16 
I1.—On a Moiccalas Change produced by the passage of 
Electrical Currents through Iron and Steel bars; by 
SOUN  TROWPEINGR: 66k is 5 ee ee 8 
Magnetism of Soft Iron; by Davip SEARS, Sg pers 21 
IV. Sie ag Notes; Tellurium Ores of ‘Colorado ; by 
We PARE AR oss ica a we eee 5 
V.—Notes on “Diffraction None ; by Joun M. Buaxkeg,... 33 
VI—On the Spectrum of the Zodiacal Light ; by Ai 
RIeHT. With Pla ng t Seine cn arene meee ae ete 39 
VII.—On the Age of the Copper-bearing Rocks of Lake Supe- 
rior; and on the Westward continuation of the LakeSupe- 
rior Synclinal; by Rotanp Irvine. With platesIV andV, 4 
VIII—On the Parallelism of Coal-Seams ; . ANDREWS, 56 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—. er and its sea hagrg ns Biocu 
Eucalyptol, Faust and Homeryer, 59.—Compounds of bage with Aleo 
radicals, Hartwie, 60.—Taurin not espace ‘ape Sem : Condensa ton ot 
Acetylene by the "Silent Electric Discharge, P. and A. peri ARD, 61.—Nitr 
compounds of the Allyl series, BRACKEBUSCH: Re fe claibts due to Heat, 
62.—Double refraction of a Viscous Fluid in motion, 6 3,—Spectroscope with 
Fluorescent oy crepe M. Lovet, 64.—Polarization of Metallic Surfaces, M. G. 
QUINCKE, 65 
Geology and Na tural History.—Small size of the Brain in Tertiary Mammals; by 
O. C. MarsH, 66.—Coal ee Lignite) in the “retaceous of Minnesota: Geological 
Survey of Pennsylvania, J. P. Lestey: Dana’s Manual of Geology, 67.—Report 
b ische, 
pe mn KD von MoJsvAR te, by E . 
On Atacamite, by E.S Dana: Changes in the character of Sy spree pall le 
by Sheep-grazii: rigyvium and XxI- 
MOWICZ, Diagnoses Plan m Japoniz, e tanical Con tibutions, by Asa 
Gray, 70. ce of Climate and To phy ees around San Fran- 
Bay, by I. G. Cooper: Catalogue of Plants growing ee ems 
in the State of New Jersey, 8) ae 
Meissner of Basle: Illustrated Catalogue of the icon: of ‘Caaaeee Zool- 
ogy, No. VIL Revision of th ini, b NDER AGassiz: I] t 
Catal f the Muse ‘om ative Z o. VII, Zoological Results 
of the Hassler Expedition; Echini, Crinoids, «nd Corals, os A. Agassiz and L. 
TALES, 72.—Habits of the California Wood-rat, by A. W. eke 13. 
—The Doctrine of Evolution, by ALEXANDER WINCHELL, TA. 
Astronomy.—On of some of the Nebule toward or from the Earth, 
by Wawa Hvaains, 75 —Astronomical Observatory in the Sierra Nevada 
Cordoba Observatory: Coggia’s Comet, 78. 
