CONTENTS. Vv 
NUMBER CXCV. 
Page. 
Arr. XX.—On the Absolute Wave-length of pee by 
UT EARGS ymitesiel BS) a Tes ea a Se PO sn ge 2 | ee eee 167 
XXI.—On the Relative Wave-length of the fines, of the 
Solar Spectrum; by Henry A. BRowuinns ee osniaen 182 
XXII—tThe Norites of the ‘‘ Cortlandt Series” on the Hud- 
son River near Peekskill, N. Y.; by G. H. Wititams _. 191 
XXTII.—Natural solutions of Cinnabar, Gold and associated 
sulphides; by Groner H. Brcowar 2) 07-222 22 222. 199 
XXIV.—Fluviatile Swamps of New England; by N. S. 
POAC I See ty ie elo ed A ee De he Lae 210 
XXV.—On the Mazapil Meteoric-iron, which fell November 
27th, 1885; by WitriAmM Karu Fieopet 2 ehh go 
XXVI.—On Oleanenias of the Eclipse of 1887, Aug. 18, 
in connection with the Electric Telegraph; by Davin 
ke opps tess See Ul eek pe eeenruell SRE Re kote MN aN OX 
XXVII.—On the new Meteorites from Carroll County, Ken- 
tucky, and Catorze, Mexico; by GrorcE F, Kunz_.--- 228. 
SCIENTIFIC INTELLIGENCH. 
Chemistry and Physics.—Production of Fluorine by the electrolysis of Hydrogen 
Fluoride, MoIssaAN, 236.— Methods of avoiding errors due to polarization, in the 
use of double image prisms: Electromotive force due to the Voltaic arc, LEO 
ARONS, 237.—Generalization of the Wheatstone Bridge, O. FROHLICH: A nearly 
perfect simple pendulum, J. IT. Botromuey: Acoustical Investigations, I. 
MELDE, 238. 
Geology and Mineralogy.—Kilauea, 239.—Origin of Mountain Ranges considered 
experimentally, structurally, dynamically and in relation to their Geological 
History, T. MELLARD READE, 240.—Skeleton of a Whale found over 130 years 
since in the St. Lawrence River Valley, near Quebec: Geological History of 
Lake Lahontan, a Quaternary Lake of Northern Nevada, ISRAEL Cook Rus- 
SELL: Geographical and Geological Distribution of Animals, ANGELO H&EITPRIN, 
242.—Manual of Mineralogy and Lithology, J. D. Dana: Chemical composition 
of the orthoclase in the Cortlandt Norite, G. H. Winuiams, 243.—Nickeliferous 
metallic Iron from New Zealand, Utricu, 244. 
Botany and Zoology.—Minor-Botanical Notes, 244.—Bibliotheca Zoologica II, 
O. TASCHENBERG, 245. 
Miscellaneous Scientific Intelligence.—The American Naturalist: The Swiss Cross, 
a Monthly Magazine of the Agassiz Associations, 246. 
