PLEASURES OF THE TELESCOPE. 



20' 



We shall only see it as a hazy speck. No. 4415 is another nebula 

 worth glancing at. It is Tuttle's so-called variable nebula. 



VULPECULA 



HERCULES 



V\ I 



SAGITTA 



DELPHINUS 



Map No. 16. 



There are three constellations represented on map No. 16 to 

 which we shall pay brief visits. First Aquila demands attention. 

 Its doubles may be summarized as follows : 11, magnitudes five 

 and nine, distance 17"4", p. 252 ; tt, magnitudes six and seven, dis- 



