178 RECORD OF SCIENCE FOR 1886. 



Photography (Stellar)— Coutiuued. 



HoitKiiTs (I.): Note on photographs of stars in Cygnus, taken in August, 1886. 



Month. Not., 47:22. 



: Photographic maps of the stars. Month. Not., 46 : 99-103. 



\Volf(C.): Coniparaison des rdsultats de I'observation astronomique directe 



avoc ceux de I'inscription photographique. Compt. Rend., 102 : 476. 

 Zengku (C. v.) : Etudes phosphorographiqnes pour la reproduction photograph- 



i(iue du ciel. Conipt. Roud., 102 : 408-410. 



Photometry. p.*112. 



(;iiANi)LEK (S. C. ), jr. Comparative (A) estimate of methods and results in stel- 

 lar photometry. [.Jft.sfr.] Proc. Am. Ass. Adv. Sc, ^5: 81. 



: Light-ratio unit of stellar magnitudes. Astron. Nachr., 115: 145-1.')4. 



Pritchard (C.) : Supplementary measures of the magnitudes of a zone of stara 

 near the equator for reference as standards of magnitude in lieu of Polaris. 

 Month. Not., 46: 439-442. 



Sawyku (E. F.) : Some account of a new catalogue of the magnitudes of south- 

 ern stars. Proc. Am. Ass. Adv. Sc, 35 : 80. Also : Sid. Mess., 5 : 299-302. 



SKKLiGKn(H.) : Bemerkungeu zu Zollner's " Photometrischen Unterauchnngen." 

 Vrtljschr. d. astron. Gesellsch., 21: 216-220. 



Planets. pU33. 



Christiansen (C.) : Bemerkungen ilber die Tempcratur der Plancten. Sirius, 

 19: 256-258. 



Planets (Minor). See Asteroids. 



Pleiades. p*10l. 



Clerke (A. M.) : [History of] the Pleiades. Nature, 33 : .561-564. 



Common (A. A.) : Nebulas in the Pleiades. Month. Not., 46: 341. 



Flammarion (C.) : Comparaison des r6sultats de I'observation astronomique avec 



ceux de photographie. Compt. Rend., 102: 911-914. 

 Henry (P.) : The photographic nebuhe in the Pleiades. Month. Not., 46 : 281. 

 Henry (Paul) and Henry (Prosper): Sur nne carte photographique du groupo 



de8P16iades. Compt. Rend., 102: 848-851. 

 Kammermann (A.): Ueber den Majanebel. Astron. Nachr., 114: 313. 

 Pkrrotin (J.): Observation de la n^buleuse de Maia. Compt. Rend., 102:544. 

 Roberts (I.) : Note on two photographs of the nebuhe in the Pleiades, taken in 



October, 1886. Month. Not., 47 : 24. 

 Struve (O.) : Ueber den Majanebel. il. Astron. Nachr., 114 : 97. 

 Weiss (E.) : Ueber die Nebel in den Plejaden. il. Astron. Nachr., 114 : 209. 

 Wolf (C.) : Comparaison des r6sultats de I'observation astronomique directe aveo 



ceux de I'inscription photographique. Compt. Rend., 102: 476. 



Potsdam Observatory. 



Publxcationen des astrophysikalischen Observatoriums zu Potsdam. Hrsg. von 

 H. C. Vogel. 5. Bd., 7 + 281 p. 4to. Leipzig, 1886. 



Prague Observatory. 



AsTRONOMiscHE Beobachtungeu an der k. k. Sternwarte zu Prag im Jahre 1884, 

 von L. Weinek. App. zum 45. Jahrgang. 74 p., 4 pi. 4to. Prag, 1886. 

 Rev. by ScHfosFELU] : Vrtljschr. d. astron. Gesellsch., 31:46-50. 



Precession. 



Flammarion (C): Le mouvement s6culaire du pAh> ot la transmission du sys- 



teme solaire. il. L' Astron., 5, 401-406. 

 Rogers (AV. A.) and Winlock (A.): Reduction of tlio positions of close circum- 



polar stars from one epoch to another. Mem. Am. Acad. Arts and Sc, 11 : 827- 



299, 1886. Jl80 Reprint. 



