ASTRONOMY FOR 1889, 1890. 179 



Photography (Astronomical). 



Flammarion (C.) Les progrds de la pbotograpbie celeste, il. L'Astron., 8: 



121-4. 1890. 

 HoLDEN (E. S. ) Photograpbiiig and seeing stars in the day-time. Astrou. Jour., 



9: 73-74. 

 Photography (Stellar). 



Another photographic chart of the heavens. Obsry., 12: ;}08-ll. 



Oharlier (C. V. L.) Auwendung der Steruphotographie zu Helligkertsmes- 



suugeu der Sterne. 8+31 p. 4to. Leipzig, 1889. 

 Pub. d. astion. Gesellsch., 19. 

 Gould (B. A.) Reduction of photographic observations, with a determination 



of the position of the Pleiades from photographs by Mr. Rutherfurd. Mem. 



Nat'l Acad. Sc, 4: 173-90 (v. 4, 3. mem.). Also, Reprint. 

 Kapteyn (J. C.) Bericht liber die zur Herstellung einer Durcbmusterung des 



siidlicheu Himmels ausgefUhrten Arbeiten. Vrtljschr. d. astron. Gesellsch., 



24: 213-20. 

 La carte photographique du ciel. L'aslron., 8: 388-91. 1889. 

 Pickering (E. C.) Photographic chart of the heavens. Obsry., 12: 375. 

 Reunion du comito international permanent pour l'ex6cution de la carte photo- 

 graphique du ciel, a I'observatoire de Paris en septeinbro 1889. 112 p., 4to. 



Paris, 1889. 

 Photometry. 



Scuaeberle (J. M.) Photographic brightness of the fixed stars. Pub. astrou. 



soc. Pacific, 1 : 53-64. 

 SCHEINER (J.) Bestimmuug der Sterugrossen aus photographischen Aufnah- 



meu. Astron. Nachr., 121 ; 49-62. 



Planets. 



Gregory (R. A.) Determination of masses in astronomy. Nature, 40: 80. 

 Hall (A.) Deduction of planetary masses from the motions of comets. Astron. 

 Jour., 9: 47. 



Pleiades. 



Elkin (W. L.) Comparison of Dr. Gould's reductions of Mr. Rutherfurd's 



Pleiades pho'lographs witli the heliometer results. Astron. Jonr., 9: 33-35. 

 Gould (B. A.) Determination of the position of the Pleiades from photographs 

 by Mr. Rutherfurd. Mem. nat'l acad. sc, 4 : 173-90. (v. 4, 3. nicm.) Aho 

 Reprint. 

 Praesepe. 



Gould (B. A.) Reduction of photographic observations of the Ptesepe. Mem, 

 Nat. Acad. Sc, 4: 193-9. (v. 4, 4. mem.) Also, Reprint. 

 Proper motion. 



Boss (L.) Proper motions of stars in the Albany zones. (+0^^ 50' toSO'^ 10' for 

 1885.) Astrou. Jour., 9: 57-64. 



Red stars. 



Clerke (A. M.) Some southern red stars. Obsry., 12 : 134. 

 Refraction. 



LAsKA (W.) Ueber eine einfache Refractionsformel. Astron. Naciir., 121 : 111. 



Lehmann-Filhes (R.) Eine geuiiherte Refractiousforniel. Astion. Nachr., 

 121: 383. 



Radau (R.) Essai sur les refractions astronomiqucs. 80 p. 4to, Paris, 1889. 

 Resisting medium. 



Hall (A.) Resisting medium iu space. Sid. Mess., 8: 433-42. 



