ASTRONOMY. 171 



in 18GG-'08; papers on the iiiotioii of the liiuar ai)si<le.s and on tlie com- 

 panion of Sirius by Professor Colbert; and an illustrated paper on the 

 physical aspect of Jupiter, a catalogue of 200 new double stars, and a 

 des(;riptiou of a printing chronograph by Professor Hough. In the 

 course of the two years referred to 130 new double stars were discov- 

 ered and measured. 



In consequence of the dissolution of the University of Chicago the 

 Chicago Astronomical Society dismounted their instruments in the 

 early i)art of 1888, and transferred the care of the observatory to the 

 Northwestern University, at Evanston, Illinois, 12 miles from the busi- 

 ness center of Chicago, about 16 miles north and 3 miles west of the old 

 site, and some 300 feet from the shore of Lake Michigan. The corner 

 stone of a new building, the gift of James B. Ilobbs, was laid June 24, 

 1888. The plau includes a tower and dome for the 18.^-inch equatorial, 

 meridian circle room, library, and about eight rooms for other purposes; 

 the whole to be erected at a cost of $25,000. The approximate position 

 is given: Latitude, -|-42o 3'; longitude, 5'' 50'" 42'* west of Greenwich. 



Denver. — A new observatory, the gift of Mr. H. B. Chamberlin to the 

 University of Denver, is being built, about 7 miles from the city of 

 Denver, at an altitude of 5,000 feet above sea-level. The i)rincipal 

 instrument is to be a 20-inch Clark refractor. Director, Prof. U. A. 

 Howe. 



Dresden. — Baron von Engelhardt's older observatory was built in 

 187T (latitude, -|-5lo 2' 31" ; longitude, 0'' 54"' 53''.3 east of Greenwich), 

 and contained an 8-inch Grubb equatorial, a 2-inch Cooke transit, ami a 

 sidereal clock by Knoblich. The present observatory was built in 1879 

 somewhat nearer the outskirts of Dresden (latitude, +51o 2' 10"; longi- 

 tude, 0'' 54"' 648.7 east of Greenwich). It consists of a three-story tower, 

 the upper story being surmounted by a cylindrical "dome" covering a 

 12-inch Grubb equatorial. The second floor connects with the transit- 

 room, in which is a " broken-back" transit, by Bamberg, of 2.7 inches 

 aperture. There is also a very complete equipment of subsidiary appa- 

 rat us, clocks, chronometers, chronograph, etc. Ui)on the adjoining roof 

 of the baron's residence is a little comet observatory arranged for two 

 instruments, one of 6.4 inches aperture and the other of 3.7 inches. The 

 larger instrument, which is similar to the Strassburg comet-seeker, is 

 of somewhat novel construction. The telescope is fastened by two long 

 arms to the back of a chair so that the eye-end comes at a convenient 

 l)osition for the observer; the arms are jjivoted to the chair- back, per- 

 mitting a motion in altitude, while the chair may be rotated in a/imuth, 

 so that the astronomer can examine the whole sky rapidly and without 

 fatigue. 



The numerous and valuable observations of occultations, ])henomena 

 of Jupiter's satellites, comets, planets, new stars, nebuhe, and clusters 

 were collected and published in the latter i)art of 1886, together with an 

 illustrated description of the observatory and instruments. Similar ob- 



