Thus Heron finds that in London during the past fifty years there has been 100 per cent increase in the intensity of the relation between low social birth and high birth-rate, and that the high birth-rate of the lower social classes is not fully compensated by their high death-rate (D. Heron, "On the Relation of Fertility in Man to Social Status," Drapers' Company Research Memoirs, No. I, 1906). As, however, Newsholme and Stevenson point out (Journal Royal Statistical Society, April, 1906, p. 74), the net addition to the population made by the best social classes is at so very slightly lower a rate than that made by the poorest class that, even if we consent to let the question rest on this ground, there is still no urgent need for the wailings of Cassandra.

Sociological Papers of the Sociological Society, 1904, p. 35.