lv CONTENTS. 
NUMBER CXCIV. 
Art. X.—Kilauea after the Eruption of March, 1886 : com- 
munications to Prof. W. D. ALexanpEeR by Messrs. 
Emerson, VAN Stryke and Doper. With Plates I and IL 
xXG=—Volcanic Action: by J. D: Dana 2.2. = 22 eee 
XII.—The Coahuila Meteorites; by O. W. Hunvineron. 
With Plate (not numbered) 223222232542 -— eee 
XIII.—A new Rhizostomatous Medusa from New England ; 
Dy .Je Wie kenwacms.) 7 Wath late Voss 2 os See eee 
XIV.—-A short study upon the Atmosphere of 6 Lyre; by 
OT OSHERMAN eh So 2 0 oe AE Es ae oe 
XV.—Phenacite from Colorado; by 8. L. PENrFieLtp. With 
notes on the locality of Topaz Butte; by W. B. Smrri- 
XVI.—The Norites of the “ Cortlandt Series ” on the Hudson 
River near Peekskill, N. Y.; by G. H. Wintiams ---.-_-- 
XVII.—A method for subjecting living protoplasm to the 
action of different liquids; by G. L. Goopatk ~_-_._-__-_- 
XVIUI.—On the Topaz from the Thomas Range, Utah; by 
BANNING, PASTING Bs BicioFis 02 RCN Sire Ys ES a qe ee 
XIX.—On a simple and convenient form of Water Battery ; 
by EWA NO WAGAIN DYE 2 Sicin SS oes ey gee Nees eee 
SCIENTIFIC INTELLIGENCE. 
Page. 
Chemistry and Physics.—Isopyenic curves, VON WROBLEWSKY: Vapor-pressure of 
Hydrated Salts, MULLER-HRzBacH, 148.—Solidification of Hydrogen fluoride, 
phosphide and antimonide, OLSZEWSKY: Fluorescence of certain Metallic Oxides, 
when exposed to an Electric discharge in a high vacuum, DE BOISBAUDRAN, 
149.— Refractive index of Carbon dioxide and of Cyanogen, CHAPPUIS and 
RivibRE: The Spectrum of Germanium: A new Quicksilver Pump, 151.— 
Relation of the Electrostatic and Klectromagnetic Units, 152. 
Geology and Mineralogy.—N otes on the Geology of Northern California, J. S 
. DIL- 
LER, 152.—The Taconic System, C. D. Watcort, 153.—Remarks on the Revision 
of the Paleeocrinoidea of Wachsmuth anc Springer, C. A. Wuirn, 154.—A ecard 
to American Geologists, 157. 
The ‘‘ Mountain limestone ” in Pennsylvania a lit- 
tle over 1100 feet below the Pittsburgh Coal: Fossil Trunk of a tree in hydro- 
mica or sericitic gneiss: Second Contribution to the Studies of the Cainbrian 
Faunas of North America, C. D. Watcorr, 158.—Geological and Natural History 
Survey of Minnesota for 1885: Aunuaire Géologique universel et Guide der 
Géologue autour de la Terre, etc. Notes on Minerals from North Carolina, 
G. vom Ratu 159.—Notes on Aquamarine from Mount Antero, Colorado, 
R. T. Cross, 161. 
Botany and Zoology.—Beobachtungen ber den Blumenbesuch von Insecten und 
Frielandpflanzen des Botanischen Gartens zu Berlin, HK. Lomw, 162.—Minor 
Botanical Notes, 163.—Botanical Necrology for 1886, 164.—Bulletin of the 
Museum of Comparative Zoology: Elementary Course in Practical Zoology, 
B. T. Couron. 
Miscellaneous Intelligence.—Ice Period in the Altai Mts., MICHAELIS, 165.—Signal 
Service Bureau, 166.—Obituary—Prof. HE. L. Youmans: Selwyn 1 L. Harding, 
Th. von Oppolzer, 166. 
