190 SCIENTIFIC RECORD FOR 1884. 



nings, both with the full objective, and through w re nettings held in 

 front of Ihe objective, so as to reduce their magnitude to a given stand- 

 ard. It was found that faint stars were observed later by 0«.007 per 

 magnitude. 



It is mentioned in this report that two observers determined the 

 places of 240 stars (using 57 fundamental stars for comparison) in four 

 nights. One observer made the pointings, the other read the micro- 

 scopes. ' 



Volume V of the Berlin Observations will shortly be printed. 



The computing bureau has issued the Berliner Jahrhuch as usual, as 

 well as the two periodicals. Circulars and Correspondence regarding ob- 

 servations of planets. 



Bonn. — The observatory continues to concentrate its efforts on two 

 great works, the Zone 40° —50°, and the southern Diirchmusterung. In 

 the latter work 114,615+1,161 stars have been observed. The observa- 

 tion and reductions of this work are now completed and the printing 

 of the catalogue is begun. 



Brussels. — The catalogue of E. Quetelet is printed from O'' to 12"^. 

 The labors of the observatory in spherical astronomy, in physical as- 

 tronomy, and celestial mechanics, as well as in regard to the transit of 

 Venus, 1882, are described in the report. 



Dresden (private observatory). — Baron v. Englehardt continues at his 

 private observatory the observations of minor planets, of comets, and 

 of nebulae. Twenty-one planets have been observed 63 times ; 3 comets 

 have been observed 43 times; 47 nebulae have been observed 95 times. 



Dusseldorf. — Ju 1883, 18 i)lauets have beoi observed 49 times; since 

 1847, 144 planets have been observed 1,151 times. 



Six asteroid orbits are computed yearly. 



Franlcfort on-the- Main {private observatory). — Herr Eppstein has made, 

 since 1881, 444 gauges, containing 8,332 stars in 113 positions on 23 

 nights. In all, about 47,000 stars in 2,426 fields in 774 positions. 



Sun-spot observations are also regularly made by Herr Eppstein. 



Geneva. — The 10 inch equatorial has been used for observations of 

 nebula}, double stars, asteroids, and satellites of Saturn. 



The small equatorial has been used to study the solar prominences. 



Gotha. — Dr. E. Becker has lately been appointed to the charge of the 

 Gotha Observatory. The larger part of the report relates to repairs 

 and to changes which have been made in the instruments. 



Dr. Becker continues the reductions of the BerlinZone + 20° to + 25°. 

 The Moon, the inferior planets and those Mayer stars not in the Funda- 

 menta will be observed on the meridian. 



Grignon. — The observatory of the Priory of St. John of Grignon, 

 was founded in 1879, and this report relates to its instrumental equip- 

 ment and to its observations of sun spots, planets, and comets. 



Hereny (Hungary). — Vol. i of its publications has been distributed. 

 The observations relate to the spectra of fixed stars, of variables, and 



