The division of labor leads to beneficial conclusions as well in astronomy as in mechanics and arts.
Mrs.Smyth and my daughter unite with me in wishing you all happiness and success; and believe me My dear Miss Mitchell, Yours very faithfully, W.H.SMYTH.
In regard to the colors of stars, Miss Mitchell had already begun their study, as these extracts from her diary show: "Feb.

19, 1853.

I am just learning to notice the different colors of the stars, and already begin to have a new enjoyment.

Betelgeuse is strikingly red, while Rigel is yellow.

There is something of the same pleasure in noticing the hues that there is in looking at a collection of precious stones, or at a flower-garden in autumn.