CONTENTS, 



Page 



Art. XVI. — Examination of Dr. Croll's Hypotheses of Geo- 

 logical Climates ; by A. Woeikof, 161 



XVII. — Tendril Movements in Cucurbita maxima and C. 



Pepo ; by D. P. Penhallow, 178 



XVIII. — Note on a Method of Measuring the Surface Ten- 

 sion of Liquids ; by W. F. Magie, 189 



XIX. — Wm. B. Rogers's Geology of the Virginias ; by J. L. 



and H.D.Campbell, 193 



XX. — Observations on the Tertiary of Mississippi and Ala- 

 bama ; by D. W. Langdon, Jr., 202 



XXI. — Area of Upper Silurian rocks near Cornwall Station, 



eastern-central Orange Co., N. Y.; by N. H. Darton,.. 209 



SCIENTIFIC INTELLIGENCE. 



Physics and Chemistry.— Dilatancy of Media composed of Rigid Particles in con- 

 tact, 0. Reynolds, 216. — Use of the Induction Spark in Spectrum work, E. 

 Wiedemann : Vapor -pressures of Mercury, Ramsay and Young, 218. — Limits 

 of the conversion of Sodium carbonate into Sodium hydrate by means of Lime, 

 Lunge and Schmid, 219. — Phenol constituents of Blast Furnace tar, W. Smith, 

 Coutts and Brothers: Presence of Raffinose in Barley, O'Sullivan, 220. — 

 Elements of Inorganic Chemistry, J. H. Shepaed: Chemical Problems, K. 

 Stammer, 221. 



Geology and Mineralogy. — Bottom Deposits from dredgings under the supervision 

 of A. Agassiz, 221. — Tornebohm on the formation of quartzite by enlargement 

 of the quartz fragments of sandstone, R. D. Irving, 225. — A Submarine Crater 

 in the Atlantic near the Canaries, T. M. Reade : Geological Sketch of the island 

 of Antigua, E. C. Purves, 226. — Pennsylvania Geological Survey, 227. — Fossil 

 Scorpion from American Rocks, and other fossils, R. P. "Whitfield, 228. — 

 Mineral Resources of the United States, A. Williams, Jr.: Contributions to 

 Mineralogy. F. A. Genth, 229. — Brief notices of some recently described Min- 

 erals, 230. ' 



Botany and Zoology. — Contributions to the- Flora of the Peruvian Andes, with 

 Remarks on the History and Origin of the Andean Flora, J. Ball, 231. — Mono- 

 graphie du Genre Thalictrum, J. C. Lecoyer, 235. — Nomenclature of Fossil 

 Leaves, etc., Nathorst, 236. — Erythrseae Exsiccataj, Wittrock: European 

 Juncacese, F. Buchenau: Rubra, Spicata, Palmata, Trifoliata, F. Pax, 237. — 

 Hepaticag Amazonicas et Andinas, R. Spruce : Sjmoptical Flora of North Amer- 

 ica, A. Gray : Prodromus Faunas Mediterranean, J. Y. Carus,' 238. 



Astronomy. — Comets (Fabry) and (Barnard), E. Weiss, 238. 



Miscellaneous Scientific Intelligence. — Isaac Lea Bibliography, N. P. Scudder, 239. 



Obituary. — John L. Campbell, 240. 



TEN-VOLUME INDEX. 



An extra number of this Journal, of fifty-six pages, containing 

 an Index to volumes xxi to xxx, was issued in January. This num- 

 ber is sent to those only who specially order it ; the price is seventy- 

 five cents per copy. The index makes the closing part of vol. xxx. 



