iv ‘CONTENTS. 
NUMBER XCVIII. 
Page 
Arr. XI.—Discussion of the Working Hypothesis that the 
= dice es Elements are Compound Bodies; by J. Norman 
SIO EUR ao catetce cece ete ee a ee eee 93 
XI. SWelasity of very Loud Sounds; by W. W. Jacquzs, - 116 
=: Rig ake Winnipeg discharged big the Minne- 
within the last two hundred years? by J. E. Topp, 120 
XIV. sels of the Spectroscopic Observation - the Solar 
e of July 29th, 1878; by G. F. Barker, ---- .--- 121 
XV. mes e of Measuring the Velocity of Sound in Wood; 
boa it MR EAE Foo Ce pgeaineg iene gene pecerammbeyrey ie, eae ge 125 
XV1—The Rélation of Secular Rock- -disintegration to Less, 
Glacial Drift and Rock Basins . EUMPELLY, -...- 
XVIL—Method of pe pear the ‘Dip; by N. D.C. Hopous, 145 
XVITII.—On a Group of dissimilar Eruptive Rocks in Camp- 
ton, New Hampshire; by G. W. Hawes, .--..-------- 147 
XIX.—Mesozoic Strata of Virginia; by W. M. Fonrarne, - 151 | 
XX.—Recent American Earthquakes; by C. G. Rovio 158 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Note on J. C. Draper’s paper ‘‘ On the presence of Dark 
Lines in the Solar Ni aetes ose gota ese closely to the lines of the Spec- 
mn, 162.—Infiuence of Pressure on Chemical — BERTHELOT: 
pec at and the Heat a: Tilt of Galli BERTHELOT, 166.—Occurrence 
of Ytterbia i in Sipylite, DELAFONTAINE: Development of Electricity as the equiv- 
Geology and Mineralogy.—The Loess of Minnesota, N. H. WincHELL, 168.—Sys- 
tematic Geology of the 40th Parallel, C. Kine, 170.—An Elementary Geology, 
designed especially for the Interior States, E. B. ANDRE 75.—An Outline 
of General Geolo; Glimmergruppe , 176. 
Botany. Sin cag car alee as a Field for Geographical Research, W. T. THIS- 
ELTON-DYER, 176.—Conspectus Flore Europez, C. F. Nyman: Botanical Ne- 
ina of abT8, 177. 
Miscellaneous Scientific Intelligence ay inns ry Lad alge nga = —Chromo- 
metry: Soong Characters of the Sauropoda, O. C. Marsu, 181.—Protrait 
NUMBER XCIX. 
Arr. ers of the Ultimate Molecule; by W. A. 
MORTON ( cee RS a 183 
—Mabins on Eozoon Canad ense; by J. W. Dawson,. 196 
XXIII.—Magnetic Storm of May 14, 197 B.« a Se 
XIV.—Flocculation of Particles, and its Physical ‘and Tech- 
nical Bearings; by E. W. Hirearp,- oe 
ope tee —Jura-Trias of Western North “America ; "by Meh 
aaa Seat se ee ere we ene eee 214 
XXXVI. sat ee of Lines of Molecular Pressure, and the 
Trajectory of Molecules; by W. Crooxzs, 218 
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