404 



INDEX. 



Peat mosses, age of, 349. 



Penns>ylvania, bituminous coal forma- 

 tion of, 77. 



■ — Geological Society, trans- 

 actions of, 391. 



Petroleum, 86, 131, 129. 



Physical observations at sea, 237. 



Plants, fossil coal,. of Ohio, &c. 1. 



Plesiosaurus in the alum shale of Eng- 

 land, 364. 



Polynesian islands, new work on, 290. 



Potash, adulterations of, 261. 



manufacture of, 261. 



of commerce in New York, 260. 



Potassa, separation of, from soda, 273. 

 Preservation of animal bodies by petri- 

 faction, 359. 



Prussic acid, apparatus for, 244. 

 Putnam hill, section of, 30. 



a. 



Cluicksilver mines of Idria, 219. 



R. 



Rafinesque, Prof, works of, 393. 



Railroad tunnel, 73. 



Rain, proportions of, at diiferent heights 



in the atmosphere, 354. 

 Red Sulphur Spring, 96. 

 Resistance of fluids, 274, 351. 

 Rising of land in Sweden, 363. 

 Roasting of copper ores, 374. 



S. 



Salines and salt springs in the Ohio val 



ley, 26. 

 Salt, manufacture of, 117. 



mountains of Ischil, 225. 



rock, theory of, 115. 



Sandstone, new red, of Massachusetts, 



bird tracks in, 307. 

 ' the matrix of dia 



mond, 366. 



rock, white, 93. 



toad in, 353. 



Saurian remains, Haw'kins' collection 

 of, 367. 



Saurian remains, in the alum shale of 



England, 364. 

 Sewell mountains, 93. 

 Silicious slate of the Kenawha valley, 



110. 

 Snakes, moulting of, 305. 

 viviparous, 304. 



Sound, progress of, 350. 



Steam engines, use of coal in, 351. 



Strong, Prof. Theodore, on the parallelo- 

 gram of fqrces, 345. 



Sulphuret of iron in coal beds, 125. 



Sulphur springs in Virginia, White and 

 Red, 94, 96. 



Sweden, gradual rising of parts of, 363. 



Swedish journals, 375. 



Temperature of the ocean, 238. 



Tilgate forest, birds in the strata of, 362. 



Toad in sandstone, 353. 



Topaz in Ireland, 374. 



Transactions of the Geological Society 



of Pennsylvania, 391. 

 Trap dykes, 351. 

 Traun stein rock, 223. 

 Tygart's valley, topography of, 54. 



Vacuum, electricity retained in, 354. 

 Vaughan, Benjamin, obituary of, 395. 

 Vine, disease of, 367. 

 Volcanic eruption, 366. 



W. 



Water, currents in, 340. 

 spouts, 254. 



Wheeling, coal deposits of, 80. 

 White Sulphur Spring, 94. 

 Woodruif, Judge S., notices of natural 

 history, 304. 



Yew tree, longevity of, 353. 



Z. 



Zodiacal light, 379. 



Zoology, new works on, 165, 397, 



