New Mathematical Libray. vol. 1, Numbers: Rational and Irrational. Ivan Niven. viii + 136 pp. vol. 2, What Is Calculus About? W. W. Sawyer. viii + 118 pp. vol. 3, An Introduction to Inequalities. Edwin Beckenbach and Richard Bellman. x + 133 pp. vol. 4, Geometric Inequalities. Nicholas D. Kazarinoff. x + 132 pp. vol. 5, The Contest Problem Book. Charles T. Salkind. vi + 154 pp. vol. 6, The Lore of Large Numbers. Philip J. Davis. x + 165 pp. School Mathematics Study Group, New Haven, Conn.; Random House, New York, 1961. Paper, $1.95. (Clothbound volumes available from Library Publishers, Chicago, Ill. $2.95)