AbstractIn November 1975, as part of a study on Population and Technology, the Science Council of Canada issuedPerceptions 1, Population Growth and Urban Problems. In July 1976, camePerceptions 2, Implications on the Changing Age Structure of the Canadian Population, by Lewisk Auerbach and Andrea Gerber. (Catalogue No. SS21-3/2-1976. Price: Canada $3.25; Other countries $3.90) Below we reprint Section IX.