604 



INDEX. 



Peltz, 499. 



Penaud and Godard, 451. 

 Perigraph, Cohauseu's, 4S5. 

 Periodicity of hurricanes, 112. 

 of the aurora, 96. 

 Peronospora iufestaus, 341, 363. 

 Ferris, 325. 

 Perrotiu, 23, 51. 

 Perry, Alexis, 72. 



Persian insect-powder, substitute for, 424. 

 Perturbations of comets, 36, 

 Pertz, Chevalier, 544. 

 Pesliu, 86. 



criticises Faye's theory, 84. 

 Peters, Prof., 316. 



Petroleum, utilization of the light prod- 

 ucts of, 522. 

 Petteukofer, Von, 194. 

 Peziza aeruginosa, 492. 

 Pfaff, Prof.,13T. 

 Pfuuds, Dr., 544. 

 Phenomena attending electric discharges, 



167. 

 Phocsena lineata, 304. 

 Phoenix Iron Company, 442. 

 Phosphate of lime, 525. 



gelatinous hydrated, 

 499. 

 Phosphor-bronze for wire ropes, 446. 

 Phosphorus oxychloride, 19S. 

 Photographic copying-paper, 4S2. 



power of artificial light, 483. 

 Photographs, etching on zinc, 479. 

 of the blood, 30S. 

 of the solar corona, 60. 

 Photography for deep-sea sounding, 151. 



recent progress in, 475. 

 Photolithographic process, new, 4S0. 

 Photometry, celestial, 7. 

 Phylloxera, ravages of, 381. 



remedy, new, 380. 

 the grape-vine, 334. 

 Physical isomerism, 215, 



observatory near St. Petersburg, 

 96. 

 Physics, general, 135. 

 Physiological action of alcohol, 286. 

 Pic-du-Midi, red snow on, 125. 

 Pickering, Prof., 99. 

 Pictet, Adolphe, 545. 

 Pierce, Dr., 339. 



Pile-dwelling inhabitants, skeletons of, 292. 

 Pilocarpus pinnatus, 527. 

 Pilot fish, the, 319. 

 Pisciculture and the fisheries, 385. 

 Phvuet, an inter-mercurial, 46. 



movement of a, in a resisting me- 

 dium, 33. 

 Planetary perturbations, theory of, 25. 

 Plautamour, Prof., 53, 106. 



and Loomis, 36. 

 Plants, acclimatization of, 348. 

 and altitude, 361. 

 glands of carnivorous, 363. 

 of New Guinea, .359. 

 Plaster casts, preservation of, 487. 



of Paris, improvement in, 488. 

 Plasticity of ice, 137. 

 Plastico-dyn amies, 138. 

 Plateau, Prof. Felix, 142, 275, 328, 336. 

 Platinum and iridium, pure, 206. 



decomposition of water by, 195. 

 stills, corrosion of, by sulphuric 

 acid, 212. 



Plazenet, 515. 



Plesiosaurs and ichthyosaurs, 318. 



Plumb-line,abnormal deflections of the, 67. 



Pneumatic tube, the, 447, 448. 



Poey, Prof. Felipe, 320. 



Poey's catalogue of Cuban fishes, 320. 



Poisson, 537. 



Polar bands, observations of, 95. 



Polarizing crystals, 272. 



Polygonum amphibium, 507. 



Ponier, Porter, 545. 



Poppe, J. A., 403. 



Porpoise in New York Bay, a new, 304, 



Potash-salts, 372, 374. 



Potato disease, the, 363, 



Potato-beetle, 334. 



-water for cleaning silver- ware, 424. 



Potatoes, autumn planting of, 368. 



Potomac Eiver fislaeries, 388. 



Potsdam Observatory, new spectrum ap- 

 paratus for the, 154. 

 solar observatory, 56. 



Potter, E, B,, 399, 



Poulkova Observatory, 5, 



Powell, Prof., 228, 257, 261. 



Powell's exploration, 255, 



Prairie chicken, domesticating the, 310. 



Preece's signalizing instruments, 170. 



Preservation of entomological specimens, 

 275. 

 of hops, 383. 

 of wood, 431. 



Pressure gauge for 54,000 pounds^ 437. 



of the air, efl'ecl of the, upon 



human life, 288. 

 on combustion, influence of, 150. 



Prevention of boiler incrustation, 436,437. 



Preyer, Dr., 525. 



Price, W. II., 123. 



Prime numbers, 3. 



Prince Edward Island, fossil reptile in, 

 315. 



Printer's ink, readily removable, 486. 



Priority of discovery of the principle of 

 the Gramme machine, 164. 



Prismatic gunpowder, 458. 



Pritchard, Prof., 53. 



Prize essays on Jaborandi, 52S. 



Prizes for astronomical works in 1876, 52. 



Probe-platte, Moller's, 267. 



Problem of Apollo, or of Delphi, 1. 



Projectiles, influence of wind on, 472. 

 resisted by the air, 81. 

 rotation of rifled, 456. 



Proper motions of southern stars, 22. 



Propulsion of air by a jet of air or vapor, 

 144, 



Protection against lightning strokes, 171, 



Proteus, reproduction In, 317. 



Pruuty, John E., 438. 



Prussian blue, fixing on fabrics, 494. 



Pterosauria, new order of, 314. 



Publications of the Bothkamp Observa- 

 tory, 51. 



Puiseux, 25. 



Purification of fixed vegetable oils, 49T. 



Purpurine from alizarine, 494. 



Putuam, Prof. W. F., 204, 



Pyrometer, new metallic, 182. 



Pyrrhophoena riefleri, 312, 



Q. 



Q,uennerst;idt, Dr., 242. 

 Quetelct, E., 114. 



