748 THE POPULAR SCIENCE MONTHLY. 



In 8 we have a very wide and easy double ; magnitudes three 

 and a half and eight and a half; distance 110", p. 75. The smaller 

 star has a lilac hue. We can not hope with any of our instru- 

 ments to see the three stars contained in /*, but two of them are 

 easily seen ; magnitudes four and seven ; distance 108", p. 172. 

 The smaller star is again double ; magnitudes seven and eight ; 

 distance 0'77", p. 88. It is clearly a binary, with a long period. 

 A six-inch telescope that could separate this star at present would 

 be a treasure. 2 1926 is another object rather beyond our powers, 

 on account of the contrast of magnitudes. These are six and 

 eight and a half ; distance 1'3", p. 256. 



Other doubles are : 44 (2 1909), magnitudes five and six ; dis- 

 tance 4'8", p. 240; 39 (2 1890), magnitudes both nearly six; dis- 

 tance 3*6", p. 45. Smaller star light red ; t, magnitudes four and 

 a half and seven and a half, distance 38", p. 33 ; k, magnitudes 

 five and a half and eight, distance 12'7", p. 238. Some observers 

 see a greenish tinge in the light of the larger star, the smaller 

 one being blue. 



There are one or two interesting things to be seen in that part 

 of Canes Venatici which is represented on map No. 11. The first 

 of these is the star cluster 3930. This will reward a good look 

 with the five-inch. With large telescopes as many as one thou- 

 sand stars have been discerned packed within its globular outlines. 



The star 25 (2 1768) is a close binary with a period estimated 

 at one hundred and twenty-five years. The magnitudes are six 

 and seven or eight, distance about 1", p. 137. We may try for 

 this with the five-inch, and if we don't succeed in separating the 

 stars we may hope to do so some time, for the distance between 

 them is increasing. 



Although the nebula 3572 is a very wonderful object, we shall 

 leave it for another evening. 



Eastward from Bootes shines the circlet of Corona Borealis, 

 whose form is so strikingly marked out by the stars that the most 

 careless eye perceives it at once. Although a very small constel- 

 lation, it abounds with interesting objects. We begin our attack 

 with the five-inch on 2 1932, and we may heartily congratulate 

 ourselves if we come off victors, for this binary has been slowly 

 closing for many years. The magnitudes are six and a half and 

 seven, distance 0'94", p. 317. Not far distant is another binary, 

 at present beyond our powers, t?. Here the magnitudes are both 

 six, distance 0*86", p. 245. Hall assigns a period of forty years to 

 this star. It is widening, 



The assemblage of close binaries in this neighborhood is very 

 curious. Only a few degrees away we find one that is still more 

 remarkable, the star y. What has previously been said about 42 

 Comaj Berenicis applies in a measure to this star also. It, too. 



