panion of great mass in an orbit only six million miles in diameter. Spica's spectrum resembles that of Sirius. The faint star which our larger apertures show about 6' northeast of Spica is of the tenth magnitude.

Sweeping westward, we come upon ∑ 1669 a pretty little double with nearly equal components of about the sixth magnitude; distance 5·6", p. 124°. But our interest is not fully aroused