lv CONTEN7S. ~“ 
SCIENTIFIC INTELLIGENCE. 
Physics and Chemistry.—On the emission, absorption and reflexion of varieties 
of heat radiated at low temperatures, Magnus, 105.—On the breadth of the 
spectral lines, Lipricu, 106.—On the position of thallium among the wicca 
AMMELSBERG: On a new method for the volumetric estimation of — 
WEIL, 108. te the utilization of the secondary products obtained in the m 
facture of chloral, Dr. A. W. Hormann: On the nature of the secondary sol 
ucts obtained in the manufacture of chloral, Kramer, 109.—On some properties 
of iron precipitated by the galvanic current, Lenz, 110.—On the a. of 
barium chlorate, BRANDAU: On the properties of Selenium, RaTHKE, 111.—On 
the preparation of nitrogen vena (nitric anhydrid), ODET and cians 112. 
the recovery of Uranium from the Phosphate, Hrtntz, 113.—On the modifications 
of sulphur trioxyd (suiphuric anhydrid), ScuuLTz-SELLACK : me the conversion of 
iso-butyl alcohol into tertiary pseudo-butyl aleohol, MarKownikorr, 114.—On 
the — of Aromatic Acids, WuRTz, 1]5.—On the ade: acids of Croton oil, 
a 6.—On the Rhenish ereosote Leinin beech-wood tar, MARASSE, 117. 
aan currents, in relation to the Distribution of sos over the Globe, 
Pict CROLL, 118. 
Geology.—Sun-Pictures of Rocky Mountain Scenery, Dr. F. V. Hayprn. 125.—On 
the Graphite of the Laurentian of Canada, J. W. Dawson, 130.—On Laurentian 
Rocks in Nova Scotia, T. Sterry Hunt, 132.—The Ornithosauria: an elementary 
study of the bones of Pterodactyles, H. G. SkELEY. 134.—First Annual Report 
of the Geological Survey of Indiana, made during the year 1869: Meek on 
Crinoids: The lifted and subsided Rocks of America, with their influences on 
the oceanic, atmospheric, and land currents and the distribution of Races, GEO. 
CaTLin, 135.—Geological Survey of Iowa, 136. 
—Die bis jetzt bekannten Schildkréten, u. d. bei. Kelheim u. Hampover 
al : On 
Prof. E. D. CorE, 140.—A new species of Tapir, from Guatemala, Prof. THEOo- 
DORE Gil, 141 Ancor to re Theory of Natural Selection, a Series of 
Essays, ALFRED RUSSELL WAL 
Astronomy.—Cordova Observatory under the direction of Dr. B. A. Goup, 144. 
—Recent Auroral displays in the United States, 146. 
Miscellaneous Scientific Intelligence—Variation in the pea of the Earth’s 
Orbit, 147.—Note on an Electrification of an Island, F. J. —Baron 
von Richthofen’s meson a in China: Thermal Units: Aidtcdemee at the Cape 
of Good Hope, 149.—American Association: British Association: Admiral 
Russell Henry ana Hey 
Bibliography.—. —A concise analytical and logical Development of the 
A System as God made it, ete., Taomas B. ButLer: Synopsis of the 
Extinct Batrachia and Reptilia of North America, Part 2d, Epwarp D. Cops: 
First Principles of Chemical Philosophy, Josian P. Cooke, Jr., 150. as Un- 
tersuchungen tiber den elektrisirten Sauerstoff; von Dr. G. Mz : Great 
Outline of Geography: a Text-Book to accompany the Universal rie THEO- 
pore §. Fay: Geology and Revelation; or the ancient history of the earth con- 
