science

Approximations for Digital Computers. Cecil Hastings, Jr., assisted by Jeanne T. Hayward and James P. Wong, Jr. Princeton Univ. Press, Princeton, N.J., 1955. viii + 201 pp. $4.

Speech: Code, Meaning, and Communication. John W. Black and Wilbur E. Moore. McGraw-Hill, New York- London, 1955. vii + 430 pp. Illus. $4.50.