Presented is an assessment of the growth of scientific and technical manpower from 1950 through 1966. The Bureau of Labor Statistics prepared annual estimates of employed natural scientists and engineers which were related to influential economic and social developments. Data were gathered on the supply, training, employment, and other personal and professional characteristics of scientists and engineers. This was the first comprehensive historial employment series for scientists and engineers that included all sectors of the economy by each major scientific occupational group conducted. (RR)