Till CONTEXTS. 



NUMBER CLXXX. 



Page 



Art. LI. — Effect upon the earth's velocity produced by small 



bodies passing near the earth ; by H. A. Newton 409 



LII. — Trend and Crustal Surplusage in Mountain Structures; 



by A. WiNCHEix 417 



LILT. — The Genealogy and the Age of the Species in the 



Southern Old-tertiary ; by O. Meyer 42 1 



LIV. — The Condensing Hygrometer and the Psychrometer ; 



by H. A. Hazen 435 



LV. — A new form of Absorption Cell ; by A. E. Bostwick.. 452 

 LVI. — Fossils in the Hudson River Slates of the southern 



part of Orange County, N. Y., and elsewhere; by N. H. 



Darton 452 



LVIL — Report of the American Committee-delegates to the 



Berlin International Geological Congress; by P. Feazer, 454 

 LVIII. — Bright Lines in Stellar Spectra ; by O. T. Sherman, 475 

 LIX. — Optical Properties of Rock-salt; by S. P. Langlet.. 477 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Reaction of Barium sulphate on Sodium carbonate, under 

 pressure, Spring: Sulphocyanuric acid, Hofmann, 481. — Synthesis of Cocaine, 

 Merck: Hydrogen Persulphide, Sabatier, 482. — Valence of Phosphorus, Mi- 

 chaelis and La Coste, 483. — Measurement of the Resistance of Liquids, Bouty 

 and Foussereau, 484. — Method of measuring the vibratory periods of tuning- 

 forks, A. M. Mater, 485. 



Geology and Natural History. — Report of the TJ. S. Geological Survey, J. W. Pow- 

 ell, 486. — Precious Metal deposits of the Western United States, S. F. Emmons 

 and G. F. Becker : Malesia, Plantae Ospitatrici : Illustrationes Flora? Atlanticte, 

 487. — Physiological Botany, G. L. Goodale: Rabenhorst's Kryptogamen-Flora 

 von Deutschland, Oesterreich und der Schweiz, von K. G. Limpricht: Structure 

 and Dehiscence of Anthers, Leclerc du Sablon, 488. — Influence of strong sun- 

 light on the vitality of Micrococcus, M. Duclatxx : Histology of Ascidia, Heckel 

 and J. Chareyre : Reserve Carbohydrates in Fungi, L. Errara, 489. 



Miscellaneous Scientific Intelligence. — Elements of Projective Geometry, L. Cremona 

 and C. Leodesdorf, 489. — National Academy of Sciences, 490. — Obituary — Dr. 

 W. B. Carpenter, 490. 



Index to Volume XXX, 491. 



