INDEX. 



415 



Planorbis, new species, 193. 

 Platinum, new compound of, 186. 



large quantity melted, 163, 155. 

 Polarized light, oxyhydrogen blowpipe 



used to exhibit, 1U2. 

 Polarizing light by mica, 101. 

 Powell, Prof., on interference of light, 

 107. 



on refractive indices, 107. 

 on wave theory, 108. 

 Prayer in the Mendi language, 48. 

 Problems, dynamical, new mode of solv- 

 ing, 106. 

 Proceedings of Boston Society of Natu- 

 ral History, 396. 



American Philosophical 

 Society, 153, 306. 



R. 



Redfield, W. C, abstract of meteorolo- 

 gical observations made at Canton and 

 St. Johns, 265. 



abstract of meteorological 

 register kept at New York. 1838 and 

 1839, 323. 



Refractive indices, 107. 



Resistance of the air to railway trains, 

 136. 



Resisting medium, probable effects of, 

 246. 



Rocks, classification of, 408. 



Rogers, Wm. B., Prof, on the tertiary of 

 Virginia, 183. 



Ruminants, follicular dentition in, 129. 



Rutland county, Eng., statistics of, 135. 



S. 



Salts, haloid, existing in solution, 118. 

 Schweitzer, G., analysis of sea water, 12. 

 Sea, depth of, determined, 161. 

 Secular variations of the magnetic needle 



in connection with theory of the earth, 



68. 

 Scirpus sylvaticus, 195. 

 Serpentine marble, analysis of, 198. 

 Shells and minerals presented to N. Y. 



Lyceum by Dr. Brinckerhoff, 198. 

 Silk, grown at Nottingham, Eng., 130. 

 Silurian system of America, 86. 

 Skulls of Aboriginal Americans, 341. 

 Small pox is on the increase, 134. 



power of new virus, 134. 

 Spectrum, solar, new observations on, by 



Sir J. Herschel, 110. 



Speculum of plate glass, 107. 



Stars, nomenclature of, to be revised, 94. 



reduction of those in the Coslum 



Australe, 94. 



reduction of those in the Histoire 



Celeste, 94. 



extension of the Astronomical So- 

 ciety's Catalogue, 95. 



Stars, shooting, of Aug. 9 and 10, 1839, 

 203. 



seen at Canton, Aug. 10 

 and 11, 1839,301. 

 Statistics of agriculture, 135. 



criminal, of England and Wales, 

 135. 

 Steam, specific gravity of, at different 



temperatures, 137. 

 Steam Navigation Journal, 205. 

 Steam ship Savannah, her log book, 155. 

 Stevelly, on cloud, wind, and rain, 105. 



on filling barometers, 109. 

 Stomach, existence of muriatic acid in 



during digestion, 119. 

 Storer, on Carcharias obscurus, 195. 

 EmyS Blandingii, 195. 

 fishes and reptiles of Massa- 

 chusetts, 379. 



Squalus elephas, 197. 

 fifteen species of Ohio fishes, 

 392. 



two species of Ray, described 

 by, 396. 

 Strang, John, letter to Prof Silliman,407. 

 Syngnathus, taken near Boston, J95. 

 Synonymy of the Orchis tribe, 306. 



T. 



Taber, Thomas, practical remarks on 



gems, 61. 

 Tails of comets, 35. 



Talbot, on Daguerre's photogenic pro- 

 cess, 97. 

 Teeth of mammalia in Suffolk, England, 

 described by Lyell, 124. 



fossil, examined by Owen,127. 

 microscopic structure of, 134. 

 Tertiary of Virginia, by Prof. Wm. B. 



Rogers, 183. 

 Teschemacher, J. E., on Elvella esculen- 

 ta,-194. 



minerals found 

 at Milk row, 194. 



plants from Black- 

 stone river, 195, 



Andromeda raa- 

 riana, 196. 



fossil coals and 

 madrepores, 197. 

 Theory of the earth in connection with 



secular magnetic variations, 68. ' 

 Tin, metallic, action of on muriate of tin, 



408. 

 Tornadoes, notices of, by R. Hare, 73. 



CErsted's memoir on, 82. 

 Tornado at Chatenay, near Paris, 77. 



Providence, R. I., 74. 

 Town, Ithiel, bis improvements in bridg- 

 es, 276. 

 Tracks of animals in variegated sand- 

 stone, 255. 

 Troost, Prof. G., analysis of a meteoric 

 mass. 250. 



