XXII.— Sliding PViction on an Inclined Plane ; A. S. Kimball, 181 

 XXIII. — On the constitutional formuUe of Urea, Uric Acid, 



and their derivatives ; by J. W. Mallet, 185 



XXIV.— On Flint-implements from the Stratified Drift of 



the vi<-.inity of Richmond, Va; by Cilvrles M. Wallace, 105 

 XXV.— Description of a new Trilobite, Dalmanites dentata; 



by S. T. Barbett, 200 



XXVI- -On the Samarskite of Mitchel Comity, North Caro- 

 lina ; by Edward S. Dana, . . . . 201 



XXVII.— Effect of Silicic Acid upon the estimation of Phos- 

 phoric acid by Ammonium Molybdate ; E. H. Jexkins, _ 204 

 XXVIII. — On the youngest Huronian Rocks south of Lake 

 and the age of the Copper-bearing Series ; by 



Brooks, 206 



XXIX.— On a new Method of measuring the Velocity of Elec- 

 tricity ; bv Joseph Lovering, ..- . 211 



Appendix.— XXX.— Principal Characters of the Tillodontia; 



byO. C. Marsh, 249 



SCIENTIFIC INTELLIGENCE. 

 Chemistry and Physics. — Problems in Chemical Dynamics, Berthelot, 214. — 

 Action of Light on Silver Bromide, Vogei., 215.— Corrosion of Platinum stills 

 by Sulphuric Acid, Schburbr-Kestneb : Production of a Secondary Hezyl Alco- 

 hol, Oechsner de Coninck, 216.— Rosolic Acid, Graebe and Card, 217.— Syn- 

 thesis of Betaine, Griess: New Acid isomeric with Alizarin, Schukk and Roe- 



uperior £ 

 '. B. Bro 



""b^A. 



and Mineralogy. — Supposed Agency of Ice-Floes in the Champlain Period, 



Second Report c 



of the State of Georgia, by G. Little, 229.— Geological S 



WoRTHEN, Director, etc., vol. vi: U. S. Geological Survey ot the Territories under 



Dr. P. V. IUydex. 2:^ L— Geological Sketches by L. Agassiz: Geological Survey 



of Victoria, Report of Progress, R. B. Smtth. 232.— Glacial phenomena along 



the Kittatinny or Blue Mountain : Wisconsin Geological Survey : Frequency of 



Earthquakes relatively to the age of the Moon, A. Perrey, 233. — Fossil Fishes 



of the Devonian of Tula, H. Trautschold; Occurrence of native Zinc: Brookite: 



Serpentines of Zoblitz Greifendorf and Waldheim. J. Lemberg, 234.— Selwyn- 



ite, Noumeite, Garnierite, G. H. F. Ulricfi : Errata to Manual of Geology of J. 



D. Dana, 235. 



Botoni/.— Notes on Agave, by Geo. Engelmanx, 23.^.— Structure of the Leaves 

 of Grasses, J. Ddval-Jouve, 237. — Botryopteris Forensis; SUicified fossil Fruits 

 or Seeds: Respiration of Plants, Mater and Wolkoff, 238.— Cb 

 Nostochineae: Gymocladus in China: Flora Brasiliensis : Das Hs 

 Loranthaceen und der Thalhis der Rafflesiaceen und Bs ' 

 Movements and Habits of Climbing Plant.", C. Darwin, 



Astronomy. — A seri " ' ' • ^^ - - - 



Our Place among 



s Sctentific 1, 

 mts in their 



