Mathematical Methods in Kinetic Theory. By C ARLO C ERCIGNANI . Plenum Press, 1969. 227 pp. $15.00. The Mathematical Theory of Non-Uniform Gases. By S YDNEY C HAPMAN and T . G. C OWLING . (Third edition.) Cambridge University Press, 1970. 423 pp. £5.00 or $16.00. Microscopic Thermodynamics. By F ELIX J. P IERCE . International Textbook Co., 1968. 492 pp. $11.95.