ASTKONOMY. 1 75 



— 20°. This iiistriiiiient has bceu dismounted and sent to Peru, where 

 the work will be continued to the south pole, and in order to extend the 

 investijjjation from stars of the ninth to stars of the fourteenth maj^ni- 

 tude, an instrument of somewhat similar form but with an objective of 

 12 inches aperture (described under Instruments) has been mounted at 

 Cambridge. 



The first extensive research undertaken with the Henry Drai)er me- 

 morial fuuds, a catalogue of the spectra of 10,875 stars, covering the en- 

 tire sky north of — 25°, is nearly completed. This work has been done 

 with the 8-iuch Bache telescope. A second series of photograi)hs made 

 with longer exposures, and so taking in fainter stars, will soon be tin- 

 ished, and this instrument will likewise be sent to Peru, where the ob- 

 servations will be extended to the south pole. The detailed study of 

 the brighter stars with the 11-iuch Draper telescope has been continued, 

 and the 15-inch and 28-iuch reflectors constructed by Dr. Draper have 

 been mounted and are employed in studying the spectra of variables. 



The Boyden fund has been devoted to collecting necessary informa- 

 tion in reganl to the meteorological conditions at high altitudes, and in 

 furtherance of this object several stations in Colorado were occupied 

 during the summer of 1887 by a party from the observatory provided 

 with special photograi)hic ai)paratus. In December, 1888, a fully 

 equipped expedition went out to California to observe the total solar 

 eclipse on January 1, 18S9, and having successfully completed that task, 

 they procewled to the southern hemisphere to occupy for several years 

 an elevated station in Peru, and to carry out the photographic and 

 photometric work mentioned above. 



Tlie compihition of observations of variable stars, the telegraphic 

 announcement of astronomical discoveries, and the time service have 

 been continued as in i)revions years, Volutne 18 of the Annals is issued 

 in parts in order to provide promi)t publication for special investiga- 

 tions. These, as well as the Draper-memorial Eeports, have received 

 notice elsewhere. The Bulletin of the New England Meteorological 

 {Society and a good deal of other meteorological work will also appear 

 in tilt' Annals. The observatory buildings have been increased by the 

 addition of two neighboring houses, and also by the erection of small 

 detached and inexpensive buildings to cover the different telescopes 

 that have been added to the equipment. 



Harerford. — Founded in 1832, enlarged in 1883. Instruments: 10- 

 iiich refractor, by Clark; SL-inch refractor, re-ground, by <31ark; 8:|^ inch 

 silver-on-glass reflector; J^f-inch zenith telescope. J)irectors: Joseph (r. 



Harlan, 1853; Samuel J. Gummerc, ; Samuel Alsop, jr., 1875; Isaac 



t^harpless, 1882; Francis P. Leavenworth, 1887. Professor Leaven- 

 worth has published a number of observations of comets. 



Hehing/ors.—Tlm 7-inch refractor has been used for observations of 

 comets, both determinations of position and careful examination of 

 physical characteristics. The transit instrtim/nt has hcvu re- modelled 



