5918 .18=**, 5029.86 Brougham, Henry, lst baron Brougham and Vaux. Tracts, mathematical and physical. London and Glasgow: R. Griffin and co. 1860. 304 pp. Sm. 8°. Contents,-General theorems; Kepler's problem; Dynamical principle, calculus of partial differ- ences, problem of three bodies; Greek geometry; Paradoxes imputed to the integral calculus; Architecture of the cells of bees; Experiments (Continued )