Abstract Abstract Business Cycles and Forecasting. Third Edition. Elmer Clark Bratt (Professor of Economics, Lehigh University, Bethlehem, Pa.). Chicago, Ill., Richard D. Irwin, Inc., 3201 S. Michigan Ave. 1948. Pp. vi, 585. $5.00. Review by Joseph A. Schumpeter Department of Economics, Harvard University Cambridge Massachusetts Probability and Induction. William Kneale (Fellow of Exeter College, Lecturer in Philosophy in the University of Oxford, Oxford, England). Oxford University Press, Amen House, London E.C. 4. 1949. Pp. viii, 264. $3.75. Review by John H. Smith Department of Statistics, American University Washington 6, D. C. Quantitative Methods in Psychology. Don Lewis (Professor of Psychology, State University of Iowa). Iowa City, Iowa, The Book Shop, 114 East Washington St. 1949. Pp. 286. Paper. Review by Philip Desind Statistician, Navy Department, Washington 25, D.C. Acceptance Sampling: A Symposium given at the 105th Annual Meeting. American Statistical Association, 1603 K Street, N.W., Washington, D. C., March 1950. Pp. 155. $1.50. Review by H. A. Freeman Associate Professor of Statistics, Massachusetts Institute of Technology Cambridge, Mass.