Pickering-] 



Pickering, Spencer [Percival] Umfreiille, & Acton, (Hits) 



Emily [Alicia]. See Aston & Pickering. 

 Pickering, Spencer [Perciral] UmfrevilU, & Brown, Horace 



T. See Brown & Pickering. 

 Pickering, Spencer [Perciral] L~mfrerille,&Tarrer, (Hits) 



E. J/. See Parrer i Pickering. 

 Pickering, Spencer [Percival] Umfrerille, & Sanford, P. 



Gerald. The composition of bydrated salts. Chem. 



News. 54, 1886. 277-278 ; 55, 1887, 22-23. 

 Pickering, William H[enry]. *Photographic focusing. 



Science, 1, 1883, 160-161. 

 Photography of the infra-red region of the spectrum. 



Amer. Ass. Proc., 1884, 111. 



Measurement of the speed of photographic drop- 

 shutters. Science, 4, 1884, 454. 



A method of measuring the absolute sensitiveness of 



photographic dry plates. Amer. Ac. Proc., 20, 1886, 159- 

 162. 



Photography of the infra-red region of the solar 



spectrum. Amer. Ac. Proc., 20, 1886, 473-477. 



Methods of determining the speed of photographic 



exposers. Amer. Ac. Proc., 20, 1886, 478-482. 



Principles involved in the construction of photographic 



exposers. Amer. Ac. Proc., 20, 1886, 483-489. 



An attempt to photograph the corona. Science, 5, 



1885, 266-267, 307, 436; 6, 1886, 131-133, 362-363, 

 387. 



A method for determining the unit of light. Science, 



6, 1886. 183. 



The color of the sky. Science, 6, 1888, 316. 



Colored media for the photographic dark room. Amer. 



Ac. Proc., 21, 1886, 244-247 ; Spettrosc. Ital. Mem., 14, 



1886, 147-149. 



The total solar eclipse of 1886. Science, 10, 1887, 9. 



The physical aspect of the planet Mars. Science, 12, 



1888. 82-84. 

 The soaring of birds. Science, 13, 1889, 31-32, 151, 



245-246. 



The total solar eclipse of January, 1889. Sidereal 



Messenger, 8, 1889, 337-339. 



Total eclipse of the Sun, August 29, 1886. Harvard 



Astr. Obs. Ann., 18, 1890, 85-111. 

 The Great Nebula in Orion. Sidereal Messenger, 9, 



1890. 1-2. 



The occultation of Jupiter, Sept. 3, 1889. Sidereal 



Messenger, 9, 1890, 148-149. 



Photographs of the surface of Mars. Sidereal Mes- 

 senger, 9, 1890, 254-255. 



Visual observation of the surface of Mars. Sidereal 



Messenger, 9, 1890, 369-370. 



The mountain station of the Harvard College Obser- 

 vatory. Astr. & Astrophys., 11, 1892, 353-357. 



The Boyden station of the Harvard College Obser- 

 vatory. Astr. & Astrophys., 11, 1892, 357-362. 



Colors exhibited by the planet Mars. Astr. <fe Astrophys., 



11, 1892, 449-453, 545-548, 632. 



The earthquake of February 23, 1892. Astr. & 



Astrophys., 11, 1892, 470. 



The " planet Saturn and its satellites. Astr. & 



Astrophys., 11, 1892, 649-652. 



Mars. Astr. & Astrophys., 11, 1892, 668-675, 849- 



852. 



The lunar atmosphere and the recent oecultation of 



Jupiter. Astr. & Astrophys., 11, 1892, 778-782. 



Astronomical possibilities at considerable altitudes. 



Astr. Nachr., 129, 1892, 97-100. 

 An investigation of the systems of bright streaks visible 



upon the full moon. Astr. Nachr., 130, 1892, 225- 



228. 

 Are there at present active volcanos upon the moon ? 



Observatory, London, 15, 1892, 250-254. 

 Plato. Observatory, London, 15, 1892, 431-434 ; 16, 



1893, 175-176. 



879 [Picone 



South American meteorology. [1893.] Amer. Meteorol. 



Jl., 10 (1893-94), 343-347. 

 The planet Jupiter and its satellites. Astr. & 



Astrophys., 12, 1893, 193-202, 390-397. 

 The rotation of Jupiter's outer satellites. Astr. & 



Astrophys., 12, 1893, 481-494. 

 Polar inversion of the planets and satellites. Astr. & 



Astrophys., 12, 1893, 692-693. 

 Telescope mountings and domes. Astr. & Astrophys. , 



13, 1894, 1-8. 

 A study of Nova Auriga and Nova Nornue. Astr. A 



Astrophys., 13, 1894, 201-204. 

 Melting of the polar caps of Mars. Astr. & Astrophys., 



13, 1894, 308 ; Observatory, London, 17, 1894, 173-174. 

 The forms of the discs of Jupiter's satellites. Astr. & 



Astrophys., 13, 1894, 423-425. 

 The seas of Mars. Astr. & Astrophys., 13, 1894, 553- 



556. 

 SCHIAPABKLLI'B latest views regarding Mars. Astr. & 



Astrophys., 13, 1894, 632-635. 

 Recent observations of the satellites of Jupiter. Astr. 



& Astrophys., 13, 1894, 728-736. 



Jupiter's first satellite. Astr. Nachr., 135, 1894, 227- 



228. 

 Investigations in astronomical photography. Harvard 



Astr. Obs. Ann., 32 (Pt. I), 1896, 1-115. 

 The new star in Carina. Observatory, London, 18, 



1895, 436. 



La lune. Rev. Sci., 4, 1895, 289-295. 



Climate as related to astronomical observations. 



Popular Astr., 3, 1896, 464-465. 

 SWIFT'S Comet (I, 1892). Astrophys. Jl., 8, 1898, 255- 



256 ; Science, 8, 1898, 459-460. 

 Entdeckung eines neuen Saturnmondes. Astr. Nachr., 



149, 1899, 31-32. 

 Observations of the November meteors. Popular 



Astr., 7, 1899, 395-403. 

 Non-appearance of the expected Leonid shower. 



Popular Astr., 7, 1899, 523-524. 

 Observations of the total solar eclipse of May 28, 1900, 



by the Harvard Observatory Expedition. Astrophys. Jl., 



12, 1900, 94-95. 



Visual observations of the moon and planets. Harvard 



Astr. Obs. Ann., 32 (Pt. 2), 1900, 117-317. 

 A possible explanation of the Gegenschein. Popular 



Astr., 8, 1900, 1-2. 

 Lunar changes during the eclipse of December 16, 



1899. Popular Astr., 8, 1900, 57-59. 



The total eclipse of May 28, 1900. Popular Astr., 8, 



1900, 225-228. 



PickerneU, F. A., Hibbard, A. S., & Carty, J. J. See 



Hibbard. Carty & PickerneU. 

 Fickersgill, Sicolas, & Xehrmann, [Johann August Lud- 



wig] Frit'drich. See Xehnnann & PickersgiU. 

 PickersgiU, Nicolas, & Messinger, Josef. See Messinger 



& PickersgiU. 

 PickersgiU, W. Clayton. Coffee cultivation in Angola. 



Kew Bull., 1894, 161-163. 

 Pickett, C. P. Breeding Sphinx Convolvuli. Ent. Record, 



12, 1900, 138. 

 Cross-pairing of smerinthid species. Ent. Record, 12, 



1900, 215-216. 

 Habits of Colias hyale. Ent. Record, 12, 1900, 294- 



295. 

 Pico, Pedro P. For biography and works see Argentina, 



Inst. Geogr. BoL, 7, 1886, 181-186; Argentina Soc. Ci. 



An., 30, 1890, 65-69. 

 Pico, Vittorio. Influenza della pressione nelTosmosi. Riv. 



Sci.-Ind., 23, 1891, 185-195, 253-260. 

 Picone, Ignazio. Osservazioni snlla eterofillia. Milano, 



Soc. Ital. Atti, 32, 1889, 97-109. 

 Studi sulle foglie delle Ranunculacee. Milano, Soc. 



Ital. Atti, 32, 1889, 111-117. 



