‘vill CONTENTS. 
NUMBER CXIV. 
P 
Arr. LVII—Physical Structure and A niall of the 
Catskill Mountain Region; by ArnoLp Guyot, ---.- --- 429 
LVITL—Recent Explorations i in the Wappinger Valley Lime- 
stone of Dutchess County, N. Y.; by W. B. Dwieut,-- 45] 
LIX.—The Color thts i certain Achromatic Object : 
Glasses ; by C. A. You tootinwiurot potuOl sce ae 
LX. —Companion of Sirius ; oe Mokena tanto gad. 457 
LXL net County Meteorite, that fell near pay rE 
Emmet County, lowa; by J. Lawrence SMivu,- ---- -- 59 
LXII. L—Oxidation of Hydrochloric eo Solutions ‘of, Anti- 
ony in the Atmosphere; by J. P. Cooxn, ---- .------ 464 
LXIIL. —Relation between the Colors io pga ee of the . 
omponents of wongtl — by E. 8. Horpen, - 467 
LXIV.—Occurrence of t e Lingula in the Trenton Lime- 
stones; b pe Ba trade Ste - 472 
V.—Experiments upon Mr. Edison’s Dynamometer, ‘Dy- 
namo-machine and Lamp; by C. F. Brackerr and 
PO ROUNG.: lal Uk eae Ue eee be 475 
VI.—Substances possessing the power of Hee hc the 
Latent Photographic Image; by M. Carry Lea,.--- -- 480 
SCIENTIFIC INTELLIGENCE, 
Chemistry and Physics.—Volumetric determination of Active Oxygen in the 
Peroxides of Barium and of Hydrogen, Bertranp: Action of Dry Sn bhtions 
into Atropine, LADENBURG. ht OnE Na of the Oxidation of Albumin by 
oa Rae a OSSEN: Maxwell’s Theory of Light, J. G. THomson: Sug- 
egard to Crysalzation St. Pane RESTON, 485.—Solubility of Gases in 
aliaas/ Faunnei y and Hogar Chemical Affinity in terms of Electromotive 
Force, Wricat: “Velocit of “Blectricity in the Electric Current, BOLTZMANN, 
Measurements of Gravity at Initial Stations in America and Europe, 487. 
Geology and Mineralogy.—Geological Survey of Pennsylvania, W. chin FONTAINE 
an 
0. Wurtr, 487.—Geology of Wisconsin, T. 0. CHAMBER: 488.— 
Paleontology of New York, J. Han rial ig: Survey « ¥ he ew Jersey, G G. H. 
OOK, 489.—Fossils in the Triassic and Jurassic beds n a in Colo- 
rado, R. C. H1uts, 490.—Note on Sauranodon, 0. C. yecign 
Botany and Zoology.—Revision aa the genus Pinus, and Description of P. Elliottii, 
Dr. G. ENGELMANN, 491.—Methodik der Speciesbeschreibung, und Rubus: 
Monographie der eintachbiitrigen und reac Brombeeren, Dr. O. KUNTZE, 
492.— Obituary.—CHARLES 
, 492 
_ of the Comet discovered by J. M. ScH#BERLE, 494. 
iscellaneous yg come east Academy of Scie Emmet 
gen iputeten J. Law fae 495.—Statistics on Harthquak es, 0. 
G. oop, Jr.: Tables "of t the Common Logarithms and Trigonometrical 
Finetions to to Six Places of Decima Is, C ', BREMIKER, 108. Obtiwary. —WILLIAM 
H. Ma 
