The impact of immigration and emigration on Canada's stock of professional and skilled manpower was analyzed for the period 1946-1963. Although the number of immigrants is recorded by Canadian authorities there is no complete record of emigration from Canada; however, a reasonably reliable picture was obtained from emigration data of other countries. An average annual migration of professional and skilled workers between 1950 and 1963 was as follows; 7,790 professional workers immigrated to Canada and 5,476 emigrated, with a net estimated immigration of 2,314 professional personnel; 18,284 skilled workers immigrated to Canada and 6,210 emigrated, with a net immigration of 12,074 skilled workers. Although similar estimates are not available for skilled occupations, it is estimated that during the period 1953-63 Canada experienced a net gain of $240 million embodied in the education of professional immigrants. (CH)