Sal'or4, T. H., prOf.eSior, Dir.ector .of Dreubom observatory. Ca t IV 
logue of .the mean D;eclinations .of 981 stars,between 
twelwe hoUl's a,nd twenty aix hours .of right Ascension and thirty 
degrees and sixty degrees of north Dec1ination, for January 1, 1875. 
Prepared nnder the Direction of Bvt. Brig. Gen'l C. B. Comstock, 

11. S. A., Major, Gorpsof Enginee;rs, in charge of U. S. Lake 
Survey. " ,. :W~hington 1873,. 
: I ,-~