Page:Popular Science Monthly Volume 47.djvu/217

Rh 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.



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°; π, magnitudes six and seven,