n] servatories that many photographs of this object were taken 

 by different observers .luring the same night. Prof. Barnard 

 made no less than 2:39 photographs on forty-seven nights, thus 

 enabling him to note the changes in the form and brightness 



of the tail, not only from night to night, bnt also from hour 

 to hour, and many of these were surprising. 



Orbit of the Morehouse Comet (190S c.) 

 (Diagram reproduced from "Popular Astronomy.") 



26 



