720 



INDEX. 



Paths of the planets, I. PI. 



34. 

 Piittens, II. 189. 

 Patterns, II. 187. 

 Paucton, II. 147. 

 Paul, II. 279. 

 Paulet, II. 186, 187. 

 Paut, 11. 190. 

 Pavements, II. 174. 

 Pavhig roads, II. 203. 

 Pear gage, I. 341, PI. 24, 



II. 254. 

 Pearl barley. If. 215. 

 Pearls, II. 519. 

 Pearson, I. 567. 

 Peart, 11. 417,437, 518. 

 Peat borer, II. 211. 

 Peat mosses, II. 498, 514. 

 Pedestrian, I. 129. 

 Pedometer, II. 156. 

 Pegasus, I. 497, 753. 

 Pemberton, I. 250, 253, 



599, II. 125, 319, 524, 



596, 643. 

 Pen, I. 94. 

 Pencil, I. 94, 95. 

 Pencil of light, I. PI. 26, 



II. 70. 

 Pencils, II. 149. 

 Pendulous bodies, II. 139. 

 Pendulum, I. 44, 107, 191, 



595, PI. 2, 5, II. 34, 146 



. . 148, 216, 343, 363. 



Circular pendulum, I. 



197. 

 Pendulum of two threads, 



II. 139. 

 Pendulums, I. 526, 578, II. 



132, 133, 136, 194, 218, 



227, 339, 358, 359, 572. 

 Penetrating into space, II. 



330. 

 Penetration, I. 144, 156, 



224, II. 140, 206. 

 Penetration of glats by wa- 

 ter, II. 379. 

 Penknives, II. 807. 



Pennant, I. 750, 756. B. 



1726, D. 1798. 

 Pennington, II. 403. 

 Pennsylvania, 11. 367. 

 Pcimyweight, II. 161. 

 Penpark hole, 11. 495, 498. 

 Penrose, II. 436. 

 Pens, 1.99,11. 144, 217. 

 Pens for lines, I. 100. 

 Pentrough, 11. 237. 

 Penumbra, I. 528. II. 313. 

 Perambulator, II. 156. 

 Perception of external ob- 

 jects, I. 449, II. 313. 

 Perception of Yegelables, 



11.513. 

 Perche, II. 151. 

 Percussion, I. 223, II. 53, 



136, 137, 140, 205. 

 Perez, II. 145. 

 Perforation in the moon, II. 



335, 336. 

 Perforation of ajar, I. 669. 

 Performance of men, 11.166. 

 Periodical springs, II. 480. 

 Periodical stars, II. 331. 

 Periodical winds, I. 701. 

 Periods of sounds, II. 544. 

 Periods of the planets, I. 



506, P1.-32. 

 Periods of the satellites, II. 



373. 

 Peripheric focus, II. 73. 

 Peripheric image, II. 76. 

 Periscopic spectacles, I. 



495, II. 315. 

 Perkinism, II. 428. 

 Perks, II. 556. 

 Permanence of sensations, 



II. 455. 

 Permanent effects of heat 



and cold, II. 403. 

 Permeability of matter, I. 



610. 

 Perpendicular, II. 9, 11. 

 Perpendicular to a plane, 



n. jr, 18. 



Perpendicular to the meri- 

 dian, II. 358. 

 Perpetual motion, I. 91, 



PI. 6, II. 142, 238. 

 Perrault, I. 204, 249. B. 



1613, D. 1688. 

 Perrault's ropes, I. 214. 

 Perret, II. 207, 208. 

 Perronet, 11. 176. 

 Perseus, I. 496. 

 Persians, I. 540, 595. 

 Person, n. 141. 

 Perspective, I. 93, 114, PI. 



7, 8, II. 21, 157. 

 Perspective instruments, 



II. 257. 

 Perspcctire practique, II. 



157. 

 Perspiration of plants, II. 



514. 

 Perturbations, I. 518, II. 



339. 

 Perturbations of the ct)- 



mets, II. 341. 

 Perturbations of the pla- 

 nets, II. 340. 

 Pestle, II. 214. 

 Petersburg, II. 246, 452. 



Academy of Petersburg, 



II. 108. 

 Petharlin, II. 496. 

 Petit, II. 383, 579, 596, 



599,601. 

 Petrefaction, II. 497. 

 Pewter ware, II. 206. 

 Pezenas, II. 370. 

 Pfaff, 1.753,11. 427. 

 Pfannenschroid, II. 314. 

 Phantasmagoria, I. 426, PI. 



28, II. 285. 

 Phases of planets, I. 527. 

 Phases of the moon, I. 528, 



345. 

 Phenicians, I. 96. 

 Pherecydes, I. 237, 253. 



B. 600, D. 515. B. C. 

 Philadelphia, II. 109. 



Philibert, TI. 324, 

 Philip, III. I. 601. 

 Phillips, II. 234, 2G3. 

 Philo, I. '24:0, 243, 253, 353, 

 Philolaus, I. 592, 604. 

 Philosophical transactions, 



11. 105. 

 Philosophical transactions 



abridged, II. 106, 107. 

 Philosophizing, I. 16. 

 Philosophy, II. 124. 

 Phloscope, II. 291. 

 Ph. M. 11. 111. 

 Phormium, II. 185. 

 Phosphorescence of vitrio- 



lated tartar, II. 293. 

 Phosphoric animals, II. 



29i 

 Phosphoric cloud, II. 482. 

 Phosphorus, I. 634. 

 Phosphorus of Bologna, I. 



435. 

 Photometers, I. 421, 699, 



PI. 27, II. 282, 351. 

 Photometry, II. 314. 

 Pholophorus, II. 283, 



291. 

 Ph. tr. II. 105. 

 Physical astronomy, I. 488, 



II. 339. 

 Physical geography, II. 



496. 

 Physical optics, I. 434, 11. 



80, after art. 460, 290, 



317, 318, 639. 

 Physical properties, II. 



509. 

 Physics, I. 485, II. 324, 



519. 

 Physikalische arbeiten,. II. 



111. 

 Physikalische belustigun- 



gen,II. 108, 109. 

 Physiological effects of elec- 

 tricity, II. 424. 

 Physiological effects of heat, 



II. 403. 



