The Dairy Industry in Canada. By J. A. Ruddick, W. M. Drummond, R. E. English, and J. E. Lattimer. Edited by H. A. Innis. (The Relations of Canada and the United States, a series of studies, prepared under the direction of the Carnegie Endowment for International Peace, Division of Economics and History; J. T. Shotwell, director.) Toronto: The Ryerson Press. New Haven: Yale University Press. 1937. Pp. xxxii, 299. ($3.75)