INDEX. 383 
Platinum, combustion of, 295 
Plumose mica, 141 ~ 
Plumbago, 238, 241 
Poison, animal, 168—antidotes, 358 
Potatoe fly, cantharidin in, 137 
Porter, T. D. contribution to Geol. Soc. 143 
Jacob, Dr. on snow crystals, 339 
Prairies and Barrens of the West, 30 
Prehnite of New-Jersey, 183, 232 
Preparations, pharmaceutical, 373 
Primitive limestone in mica slate, 211 
Principles, proximate, of the hop, 307 
Prince, James, on sea serpent, 157 
Problems, mathematical, 54, 266 
Prussic acid, 81 
Purple of Cassius, new mode of preparing, 350 
Quartz crystals with water, 14 
R. 
Rafinesque, reply to, 134 Rattle snakes, 229 
Red sandstone of North-Carolina, 175 = Remilla Americana, 3% 
Revue Encyclopedique, 164 Rhinoceros, fossil bones of, 145 
Rochester, town of, 252 Rocks, succession of, 235 
Romanzow, Count, his expedition, 345 
Rosin, bubbles blown in, 179 Rot, dry, 114 
Rubellite of Kingsbridge, 367 Ruby, fusion of, 292 
Rush, Dr. on sugar of the maple, 261 Rye, ergot of, 45 
Ss 
Salisbury iron ores, 213 Sandstone of New-Jersey, 190 
Sappar, 141—fusion of, 291 
Say, Thomas, on fossil shells, 34 
Scenery near New-Haven, 234 
at the mouth of the Genesee River, 251 
Screws, manufactory of, 208 
Serpent of the sea, documents respecting, 147 
Serpentine of Middlefield, 236 
Shells, known and unknown, 244 Shrubs on the Kaatskills, 26 
Sidero graphite, 176, 370 Silex, fusion of, 292 
Silliman, B. on Prussic acid, 81 
communication to Geol. Soc. 201 
experiments with gas blowpipe, 282 
Simplon, wad of, 1 Skeletons, human, ancient,in Ohio, 243 
Slate and sandstone, 15—chlorite, 247—argillaceous, 248 
Slaty rocks, primitive, 203 Snow and hail, 132 
Snow, crystals of, 337, 356 cylinders of, 375 
Society, American Geological, 139—Egyptian, 345 
Astronomical, 364—Geological, of London, 353 
Spar, bitter, 236 Staurotide, 141 
Steam engine of Morey, 101, 106, 112 
