764 ASTRONOMICAL 



Photography CStellai) — Continued. 



. Preliminary notice of the reduction of Rutherfurd's star-plates. Obsry., 



15 : 49-55. 1892. 

 Wellman (V.) Hiilfsinittel zur Erkennung von Beweguugserscbeinungen auf 



Photograpliieu des Sternhimuiels. Astrou. Nachr., 131: 31. 1892. 

 Wolf (M.) Photographische Messung der Sternhelligkeiten im Stevnhaufen. 



G. C.,4410. Astvon. Nachr., 126:297-310. 1891. 



Photometer. 



Wilson (W. E.) New pbotograpbic photometer for determining star magni- 

 tudes. Montli. Not., 52: 153-5. 1891. 



Photometry. 



AiJXEY (W. de W.) Estimation of star magnitudes by extinction with the 



wedge. Month. Not., 52:426-9. 1892. 

 GORR (J. E.) luteusitj'- of the images of stars as affected by wire-gauze screens 



placed before object glasses. Obsry. 15:106-8. 1892. 

 SciiKiNKii (J.) Photograi)hisch-iihotometrische Untersuchnngen. Astron. Nachr., 



128:113-22. 1891. 



Planets. 



Flammakion (C.) Idee d'une communication entre les moiidcs: a ])ro])()s d'un 

 testament astronomiiiue. L'Astron., 10:282-7. 1891. 



Planets (Figure of.) 



Callandkic.'VU (O.) Mo'moire sur la theorie de la figui-e des ])lanctes. N4 p. 4to. 

 [n. p. n. d.] 



Kepr. from : Ami. de lObs. de Pari.s M(-m, 19, 1891. [ '] 



Pleiades. 



Barnard (E. E.) Nebulosities of the Pleiades, and on a n3W Merope nebula, il. 



Astron. Nachr., 126: 293. 1891. 

 Jacoby (H.) The Rutherfurd photographic measures of the group of the 



Pleiades. Ann. N. Y. Acad. Sc, 6: 237-330. 1892. Also Reprint. 

 liev. by Scheiner (J). Vrtljsclir. d. A.stron. Gesellsch., 27: 206-13. 1892. 

 Pritciiard (C.) Newly discovered Merope nebula. Astrou. Nachr., 126: 397. 



1891. 

 RoGEiLS (W. A.) Division errors of the graduated scale used in the Rutherfurd 



photographic measures of the Pleiades. Astron. Jour., 12: 129-33. lf<92. 



Pogson (Norman Robert). [1829-'91.] 



For Biography, see Month. Not., 52: 2:i.''.-8. 1892. 



Potsdam Observatory. 



Lkuschneu (A. 0.) [Description of buildings and instruments.] I'ub. Astron. 

 See. Pacific, 4 : 40-5. 1892. 

 Precession. 



Kreutz (H.) Hiilfsgrossen zur Berechnung der Praecession nach Strnve fiir 

 mehrere (ifters vorkonunende Epochen. Astron. Nachr., 128:250. 1891. 

 Precession (Constant of). 



Ristenpart (F.) Untersuchnngen iiber die Constante der Praecession uud die 

 Bewegnng der Sonne im Fixsternsysteme. VerJiffentl. d. grossherzog. Strnwrt 

 Karlsruhe, 4: 197-288. 1892. 

 Procyon. 



8truve(L.) Unregelmiissige Eigenbewegung von Procyon nach. (). Struve's 

 Mikrometermessuugeu. Astron. Nachr., 130: 177-86. 1892. 

 Prominences (Solar). 



EvERSHED (J.) jr. Distribution of the solar ]tn)miuences of 1891. .1. Brit. 



Astron. Assn., 2:174-7. 1892. 

 Fenyi (J.) Eine am 3 Oct., 1892, beobachtete gros.se Protnberanz. il. Astrou. 

 Nachr., 131 : 213. 1892. • 



