CONTENTS. 
7 Page, 
Art. X.—Kilauea after the Eruption of March, 1886: com- 
munications to Prof. W. D. AtexanprER by Messrs. 
Emerson, VAN StyKe and Doper. With PlatesIand II 87 
XL—YV olcanic Action; by J. D.Danaa. 5s Dee 102 
XII.—The Coahuila Meteorites; by O. W. Hunvzineton. 
With Plate ITE(not-numbered) — 2.2 eee 
XIIL.—A new Rhizostomatous Medusa from New England; 
by J: W. Fawkes. “With Plate LV 32522 ss eee 
XIV.—-A short study upon the Atmosphere of 6 Lyre; by 
OTR SHERMAN SS ae c8 oes th ee ie ee 126 
XV.—Phenacite from Colorado; by 8. L. PEnriexp. With 
notes on the locality of Topaz Butte; by W. B. Smira_ 130 
XVI.—The Norites of the “ Cortlandt Series ” on the Hudson 
River near Peekskill, N. Y.; by G. H. Wittiams --.--- 135 
XVIL—A method for subjecting living protoplasm to the 
action of different liquids; by G. L. GoopaLm -__-___-- 144 
XVIIT.—On the Topaz from the Thomas Range, Utah; by 
AS NSA DDING: 2G Seer os eM See eee 146 
X1IX.—On a simple and convenient form of Water Battery; 
bye A] ROWLAND 3 2602 oe eee eee 147 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Isopycnic curves, VON WROBLEWSKY: Vapor-pressure of 
Hydrated Salts, MULLER-HazBacH, 148.—Solidification of Hydrogen fluoride, 
phosphide and antimonide, OLszeEwsky: Fluorescence of certain Metallic Oxides, 
when exposed to an Hlectric 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 Electromagnetic Units, 152. 
Geology and Mineralogy.—Notes on the Geology of Northern California, J. 8. Dit- 
LER, 152.—The Taconic System, C. D. Waucort, 153.—Remarks on the Revision 
of the Paléeocrinoidea of Wachsmuth and Springer, C. A. WHITE, 154.—A card 
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 Cambrian 
Faunas of North America, C. D. Watcort, 158.—Geological and Natural History 
Survey of Minnesota for 1885: Annuaire Géologique universel et Guide der 
Géologue autonr de la Terre, ete: 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 uber den Blumenbesuch von Insecten und 
Frielandpflanzen des Botanischen Gartens zu Berlin, E. Lomw, 162.—Minor 
Botanical Notes, 163.—Botanical Necrology for 1886, 164.—Bulietin of the 
“Museum of Compirative Zoology: Elementary Course in Practical Zoology, 
B. T. CouTon. 
Miscellaneous Intelligence.—Ice Period in the Altai Mts., MICHAELIS, 165.—Sienal 
Service Bureau, 166.— Obituary—Prof. H. L. Youmans: Selwyn L. Harding, 
Th. von Oppolzer, 166. 
