154 RECORD OF SCIENCE FOR 1886. 



Annals have been published. The library has increased to about thirty- 

 seven hiindied volumes. 



Prague (1885). — Professor Safarik has devoted his attention to varia- 

 ble stars. 



Princeton (188G). — The 23-inch equatorial has been used by Professor 

 Younf? in niicroiuetrical work upon close double stars, the satellites of 

 Uranus and Neptune, the surface markings of Jupiter, and the details 

 of Saturn. Comets are observed when they have become diflicult ob- 

 jects for smaller instruments. Occasional spectroscopic observations 

 • are made of sun-spots, prominences, and comets. The institution has 

 no endowment which would make it possible to undertake any extensive 

 or continuous programme of work. The small observatory is used 

 almost entirely for instruction in practical astronomy, this part of the 

 work being under the immediate sui^ervisiou of Professor McNeill. 



PulJcowa (1886). — The annual report of Dr. Struve is for the year 

 ending May 25, 1886. The great routine work, the determination of 

 star-positions, has been continued as in former years. Tlie 30 inch re- 

 fractor, in the hands of Dr. Hermann Struve, has been employed in 

 observing the faint double stars of Burnham's catalogue, the satellites 

 of IMars, Saturn, and Neptune, the Maia nebula and Nova Andromedie, 

 which was easily visible on January 27. Dr. Hermann Struve speaks in 

 the highest terms of the instrument, both as regards its optical power 

 and its mounting, the movement of the dome, etc. Backlund has meas- 

 ured with the 4-inch heliometer the positions of Jupiter's satellites, for 

 a determination of the mass of the planet and the orbits of the satellites. 

 Hasselberg has been experimenting upon photography of the solar spec- 

 trum. The observatory has met with a severe loss in the recent death 

 of Herr Wagner. 



Radcliffe Observatory (1886). — Observations have been made of the 

 sun, the moon throughout the lunation, occultations by the moon, and 

 the phenomena of Jupiter's satellites. Volume 41, containing results 

 for 1883, has been published. 



Rio Janeiro (1886). — M. Cruls announces that the observatory is to 

 be transferred to a new site, nearly on the same parallel as the present 

 observatory, but two minutes of time farther west. M. Cruls has been 

 commissioned by the Emperor of Brazil to have a photographic appa- 

 ratus constructed similar to that at Paris, in order to co-operate in the 

 jiroposed photographic survey of the heavens. 



Rousdon (1886). — A private observatory erected in 1884 and 1885 by 

 Mr. Cuthbert E. Peek at Eousdon, near Lyme Regis, Devon, England. 

 The principal instruments are, a 6.4-inch equatorial objective by Merz, 

 mounting by Cooke, a 2 inch Troughton & Simms transit, chronometers, 

 etc. Beneath the equatorial room is a laboratory which is also fitted 

 for photography. In 1886 the comets of the year and a list of long- 

 period variables were observed, and transit observations were made for 

 rating the chronometers. A volume containing observations of comets, 



