42 ANNUA! BECOBD OF SCIENCE AND INDUSTRY. 



The Zo%iacal Lighl and the Milky-way have both been particu- 

 larly Btudied on every favorable occasion, and elaborate drawings 

 representing them in their most characteristic appearances have 

 been produced. 



Besides, a Beries of thirty-four astronomical drawings in pastel 

 was prepared from the above observations and drawings, and exhib- 

 ited at Philadelphia at the International Exhibition. 



Comparatively few of the results of these observations have yet 

 been published. In 1875 two papers were communicated to the 

 American Academy of Arts and Sciences: 1st. "On Some Physical 

 Observations on the Planet Saturn;" 2d. "On Veiled Solar Spots." 

 [n 1877 three papers were presented to the Academy: 1st. "On the 

 Moon's Zodiacal Light;" 2d. "Vibrations Observed in the Tail of 

 Cosrsria's Comet;" 3d. "Sudden Extinction of the Light of a Solar 



SO i ^ 



Protuberance." 



The scries of 127 drawings of Jupiter, made during the year 187G, 

 were forwarded to the " Jupiter Committee" of the Royal Astronom- 

 ical Society in London, and thence sent to Dr. Oswald Lohse, at 

 Potsdam, for discussion, in order to ascertain whether there be any 

 connection between the changes on Jupiter and those on the sun. 



A series of twenty-five large astronomical drawings, intended for 

 the use of schools and colleges, is now in process of preparation, 

 and will soon be issued by Messrs. J. H. Bufford's Sons, of Boston, 

 who have reproduced in chromo the best of the drawings exhibited 

 at Philadelphia. 



The numerous drawings of Mars obtained during the favorable 

 opposition of the present year will enable me to perfect the map of 

 Mars, or at least that of its southern hemisphere. 



During the next year it is intended to continue observations on the 

 physical appearance of the sun, etc. Mars will be followed as long 

 as possible for the study of its climatology. Saturn will be closely 

 watched for the phenomena exhibited at the disappearance of the ring. 

 The study of Jupiter, commenced two years ago, will be continued. 

 The study of the moon will also be continued, with a view to make 

 the needed corrections to its existing maps, and with the intention to 

 give at some future time a general view of our satellite as it appears 

 .it the most favorable moments. The study and delineation of the 

 clusters and nebulae will be continued, with the hope that, some day, 

 means of publishing the results will be found. 



Dearborn Observatory, Chicago, 111. 



, Director. 



In reply to your circular requesting information in regard to the 

 work, etc., of the Dearborn Observatory, I beg to say: Since July 

 of the pre, nt year 1 have been using (unofficially) the 18i-iuch 



