W. H. Smyth 
Sidereal Chromatics [PDF ebook] 
Being a Re-Print, With Additions, From the Bedford Cycle of Celestial Objects, and Its Hartwell Continuation, on the Colours of Multiple Stars

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Therefore the number of red or reddish stars is double that of the bluish tinge, and that of the white stars is twice and a half greater than the red ones. The combination of a blue com panion with a coloured primary happens.