10 



SCIENCE. 



[N. S. Vol. IX. No. 210. 



Eeports on the observations of Encke's comet dur- 

 ing its return in 1871, by Professors Hall and Hark- 

 ness, Washington Observations, 1870, App. II. 



Chronometer rates as eftected by changes of tem- 

 perature and other causes, by Commander C. H. Davis, 

 Jr., Washington Observations, 1875, App. III. 



The following differences of Longitude 

 have been determined between Washington 

 and 



Havana, Cuba, Professor Harkness, Washington 

 Observations, 1867, App. I. 



St. Louis, Professor Harkness, Washington Obser- 

 vations, 1870, App. I. 



Detroit, Mich. 1 pj.ofgggor Eastman, Washington 



Larlin, xsev. > Observations, 1872, App. II. 



Austin, Nev. J . > t-i- 



Ogden, Utah, Professor Eastman, Washington Ob- 

 servations, 1874, App. II. 



Sayre Observatory, South Bethlehem, Pa.; Profes- 

 sor Eastman, Wa.shington Observations, 1875, App. I. 



Cincinnati Observatory, Professor Eastman ; Wash- 

 ington Observations, 1876, App. IV. 



Morrison Observatory, Glasgow, Mo.; Professor 

 Eastman, Washington Observations, 1876, App. V. 



Observatory Princeton, N. J. ; Assistant Astronomer 

 Paul, Washington Observations, 1878, App. II. 



The zone observations made in 1846-1849 were pub- 

 lished as follows : 



Meridian circle zones observed in 1846 (a separate 

 publication) contains 4,054 stars, 1860. 



Mural circle zones 14,804 stars, Washington Ob- 

 servations, 1869, App. II. 



Transit zones, 12,033 stars, Washington Observa- 

 tions, 1870, App. IV. 



Meridian circle zones observed in 1847, '48, '49, 

 7,390 stars, Washington Observations, 1871, App. I. 



Results of observations made with the transit in- 

 trument and mural circle, 1853 to 1860 inclusive, 

 Washington Observations, 1871, App. II. 



Report of Lieut. A. G. Winterhalter as delegate of 

 the United States Naval Observatory to the Astrophoto- 

 graphic Congress held in Paris 1887 ; with a report on 

 European observatories, Washington Observations, 

 1885, App. I. 



Announcement of the discovery in April 1888, and 

 the subsequent determination of the elements, of a 

 new short-period variable star, S Antlise =: No. 3407 

 of Chandler's catalogue ; by Assistant Astronomer H. 

 M. Paul, Astronomical Journal No. 215. 



A magnetic observatory was arranged by 

 Maury in 1845, but its construction was so 

 faulty and inadequate that its use was soon 

 discontinued. Nothing further was done 



in reference to magnetic observations un- 

 til 1887, when the Bureau of Navigation 

 erected on the grounds of the Naval Ob- 

 servatory a complete magnetic outfit which 

 was provided with facilities for obtaining 

 continuous photographic records of declina- 

 tion, inclination and horizontal force. In- 

 struments were also provided for the neces- 

 sary absolute determinations of the magnetic 

 elements. This magnetic outfit was turned 

 over to the Observatory in July, 1887. Ob- 

 servations were commenced soon after that 

 date, and continued until September, 1892, 

 when the instruments were removed to the 

 new site. 



The preparations for the observations of 

 the transits of Venus of 1874 and 1882, by 

 the United States Transit of Venus Com- 

 mission, were made at the Naval Observa- 

 tory as the headquarters of the operations 

 of the Commission, but although this work 

 was done principally by Professors New- 

 comb and Harkness, it was entirely distinct 

 from the work of the Observatory. 



During the years 1885, 1886 and 1887 

 Professor S. J. Brown, U. S. N., was per- 

 mitted by courtesy of the Superintendent 

 of the Naval Academy to use its 4 -inch 

 Eepsold meridian circle as an adjunct of 

 the Naval Observatory in making a series 

 of determinations of the positions of the 

 303 stars which had been selected to serve 

 as the basis of the German Astronomical 

 Society's southern zones. 



When it became known that the work of 

 the Naval Observatory would be inter- 

 rupted by its removal to a new site the 

 trustees of the Washburn Observatory, of 

 Madison, Wis., very considerately offered 

 the free use of the instruments of the Wash- 

 burn Observatory to the staff of the Naval 

 Observatory during that period. In ac- 

 ceptance of this invitation Professor S. J. 

 Brown went to Madison on the conclusion 

 of his Annapolis work, and from October, 

 1887, to October, 1890, conducted a series of 



