ASTRONOMY. 89 



University Observatory, Warsaw. 

 Dr. I. Wostokoff, Director. 



The instruments of this observatory are : Vertical Circle, 3 feet di- 

 ameter ; Transit, 4 inches aperture ; and a 6-inch Equatorial. 



Dr. Kowalczyk observed with the Meridian Circle stars of the 

 zone 1 50' to 7 10', on the plan of the German Astronomical 

 Society. Fifteen hundred observations have been made. Three 

 determinations of the latitude have been made at this observatory : 

 1830-43, Meridian Circle, 52 13' 5.6"; 1846, Universal Instrument, 

 52 13' 5.7"; 1877, Vertical Circle, 52 13' 4.6". 



Imperial Observatory, Vienna. 



Dr. Palisa, with the 6-inch Fraunhofer, has observed asteroids and 

 comets. 



Dr. Weiss has used the same instrument in observing suspected 

 variable stars discovered by him. One of these stars is LI. 28607, 

 which varies from 7.0 to 8.8 magnitude in a period of four months. 

 This star has proper motions of 0.08 s and 0.35". The neigh- 

 boring star LI. 28590 apparently has a proper motion of 0.2''. 

 Another adjacent star, LI. 28590 (double), is slightly variable. 



Dr. Holetschek is observing, with the Meridian Circle, the funda- 

 mental stars of the Vienna zones, 4-15 and +18. 



The new observatory buildings will probably be completed in 

 1878. The crown-glass of Grubb's 27-inch Refractor is not fin- 

 ished. The Clark 12-inch is not yet mounted. 



University Observatory, Zurich. 



Dr. It. Wolf, Director. 



Sun-spots have been daily observed ; in 1877 on 307 days. Draw- 

 ings of Mars, Venus, Jupiter, Saturn, the moon, a few nebulae, etc., 

 have been made by Dr. Wolf. 



ADDENDUM. 



The report of the Dudley Observatory, which should have been 

 inserted among those of other American observatories, has not been 

 forwarded to the compiler, although, had time allowed, it would 

 have been prepared by the Director, and inserted here. From data 

 kindly furnished by the Director, the following abstract is given of 

 one important paper; and it may be further mentioned that actual 

 work has commenced on the zone undertaken by this observatory. 



In a paper on the Transit of Mercury, read before the Albany In- 

 stitute, Professor Lewis Boss, the Director of the Dudley Observatory, 



