O.
Ohio, notes on, [207]
—its medical college, [311].
Opal, semi, [225], [237].
Ophisaurus ventralis, [262].
Organized remains, Brongniart on, [71].
Oxygen gas, respiration of, [95].
P.
Paint, rock, [77].
Paris, porcelain of, [56].
Paris, (Dr. John Ayston) on sandstone, [234].
Passage, northwest, [101].
Peat of Dutchess county, [139].
Peril, (Mr Pelatiah) [85].
Perkins, (Dr. Benjamin) [37].
Petroleum, [49].
Phalæna devastator, [154].
Picture of Independence, [200].
Pierce, (James, Esq.) on magnesia, [54], [142]
—on Staten-Island, [143].
Plants of Cherokee country, [245].
Plumbago, [239].
Pole, north, attempts to discover the, [101].
Pomeroy, (T.) his certificate, [87].
Porcelain and porcelain clays, [57].
Porter, (Dr. J.) on vegetation at Plainfield, [254].
Potato, Prof. Ives on, [297].
Powders, fulminating, [168].
Prairies and barrens of the west, [116], [331].
Prehnite, [50], [135].
Pyrites, magnetical, [49].
Pyroxene, red, [244].
Q.
Quartz, [53], [237], [238], [241], [340], [345].
R.
Ray (solar) connexion with magnetism, [90].
Rafinesque (C. S., Esq.) on vegetation, [77]
—on mustela vulpina, [83]
—on copper-head, [84]
—on sponges, [149]
—on Xanthium maculatum, [151]
—Exoglossum, [155]
—on Diplocea barbata, [252]
—on discoveries in the West, [311]
—on genus Floerkea, [373]
—on Cylactis, &c., [377]
—on Myosurus shortii, [379]
—atmospheric dust, [397].
Rain, red, [309].
Refraction, (polar) effects on magnetism, [90].
Respiration of oxygen gas, [95].
Review of Cleaveland's Mineralogy, [35].
Reynolds (Dr. W. G.) on meteors, [266].
Ridge, (Blue) its geology, [217].
River, (White) in Java, [59]
—In a cave, [320].
Rock paint, [67].
Rocks, transition, of East Tennessee, [61]
—Of Indiana, [131]
—Secondary, [213].
Rottböllia, [355].
S.
Sandstone, old red, [212]
—of the Capitol, Washington, [215]
—of Cornwall, England, [234].
Salt, its effects on vegetation, [389-391]
—on animals, [394].
Salts of Harrodsburg, [403].
Say (Mr. Thomas) on Herpetology, [256]
—on zoophytes, &c., [381].
Schaeffer, (Rev. F. C.) on peat, [139]
—localities, [236].
Sea-water, (distilled) [172].
Seybert, (Dr. Adam) [37].
Sienite, [106].
Sheldon (Wm.) on tanning, &c., [312].
Silver, (fulminating) accidents from, [169].
Sines and Cosines, formulæ for, [424].
Slate, argillaceous, [62], [67], [70], [342].
Smith (Professor E. D.) on earthquakes, &c., [93].
Soapstone, [62].
Society, (American Geological) [442].
Southampton level, [137].
Spar, (fluor) [49], [52].
Sponges, on Long Island, [149].
Springs, saline, [49]
—mineral, [66].
Steam decomposed, [92]
—engine, [93]
—rotatory of S. Morey, [162].
Stilbite, [134].
Stilson (Mr. W. B.) on Indiana.
Storms, salt, [388].
Strong's (Prof.) mathematical papers, [424].
Sullivan (John S., Esq.) on heat and light, [91]
—on steam engines, [157].
Sulphur, (native) [237]
—springs in Indiana, [133].