_Presl_, notice of the Genera Fileacearum of, xxxix, 174.
Press, botanical, _J. Locke_, xxx, 54.^f ----, printing, see _Printing_.
Pressure in the ocean at great depths, see _Ocean_. ----, atmospheric, see _Barometrical_. ---- on the human body, variations of, and apparatus for withdrawing, xxxiv, 30. ----, effect of instantaneous, as compared with accumulative, _C. Bonnycastle_, xl, 32.
Price of labor and subsistence in some parts of Europe, xxxvi, 176.
_Priestley, J._ philosophical character of, _W. Henry_, xxiv, 28. ----, discoveries by, xxiv, 30.
_Prince, James_, on the sea-serpent, ii, 154.
_Prince, W._, a fruit, between the Spanish chesnut and the Maryland chinquapin, iii, 77.
Prince Regent's Inlet, geology of, xvii, 10.
Princeton, battle of, painted by J. Trumbull, xxxix, 231.
Principia of Newton, new edition of, vi, 379. ---- ----, review of, xi, 238; xii, 28, 330; xiii, 311.
Printing on zinc, x, 388. ----, a mode of stereotyping by Senefelder, xi, 386. ----, invention of stereotyping, xvii, 161. ----, stereotype, original papers by _C. Colden_ and _B. Franklin_ on, xxiv, 319. ---- designs, new mode of, vii, 191. ----, anastatic, xlix, 401. ---- press, improvements in, by J. I. Wells, iii, 311.^f ---- ----, inking machine, Wood's, xxiii, 103.^f ---- ---- for the blind, v, 385.
Prisons, Society for the Amelioration of, iii, 374.
Prizes offered by the Royal Society of London, xxv, 412.
Prize given by the Royal Society to _J. F. W. Herschel_, for a paper on double stars, xxv, 412. ---- respecting the ammoniacal azoturet of potassium, offered by the St. Petersburg Academy, xxv, 205. ----, the Montyon, presented, xxv, 189. ----, the De Lalande, given to E. Sabine, xii, 194. ----, ----, xxv, 190. ---- of the Academy of Sciences, xiv, 380, 389; xxii, 194.
Problems, diophantine, xxxi, 156. ----, dynamical, new solutions of, xxxviii, 106.
Profile mountain, New Hampshire, _M. Field_, xiv, 64^f; xxxiv, 122.
Pronouns, nature of, explained, xxxiv, 337.
Proportions, definite, in Chemistry, _D. Olmsted_, xii, 1.
Prospect Hill, East Haven, Ct., scenery of, vii, 3.
Proteus of the North American Lakes, _S. L. Mitchill_, iv, 181; vii, 68.^f ----, _D. H. Barnes_, xi, 285.
Protococcus kermesinus, analogous to red particles in blood, xxxvi, 206.