30 MARCH 1867, Page 22

Tfigottometry for Beginners. By J. Todhnnter. (Macmillan.)—This It a Mae

work intended to serve as an inn-eduction to the larger treatise en-the same subject by the same author. A short extract will perhaps show-the nature of the volume:— " Cos. ax cos. bx cos. (a+c) z cos. ( b+c) x."