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THE POPULAR SCIENCE MONTHLY 



and eight, distance 55", p. 144, colors finely contrasted, pale yellow 

 and red. 



Much more interesting, however, is 70, a binary whose com- 

 ponents have completed a revolution since their discovery by Sir 



a, 



William Herschel, the period being ninety-five years. The mag- 

 nitudes are four and six, or, according to Hall, five and six, dis- 

 tance in 1894 2'3". Hall says the apparent distance when the stars 



