Deaf-mutes, England Schuster Probably complete 6.2 Deaf-mutes, America Schuster Probably complete 6.1 Tuberculous stock Pearson Probably complete 5.7 Albinotic stock Pearson Probably complete 5.9 Insane stock Heron Probably complete 6.0 Edinburgh degenerates Eugenics Lab Incomplete 6.1 London mentally defective Eugenics Lab Incomplete 7.0 Manchester mentally defective Eugenics Lab Incomplete 6.3 Criminals Goring Completed 6.6 English middle class Pearson 15 years at least, begun before 35 6.4 Family records--normals Pearson Completed 5.3 English intellectual class Pearson Completed 4.7 Working class N.S.W. Powys Completed 5.3 Danish professional class Westergaard 15 years at least 5.2 Danish working class Westergaard 25 years at least 5.3 Edinburgh normal artisan Eugenics Lab Incomplete 5.9 London normal artisan Eugenics Lab Incomplete 5.1 American graduates Harvard Completed 2.0 English intellectuals Webb Said to be complete 1.5 All childless marriages are excluded except in the last two cases. Inclusion of such marriages usually reduces the average by 0.5 to 1.0 child. The table given shows clearly what stocks are maintaining, what increasing, and what diminishing their numbers. This subject has been investigated recently in a rather extensive way by David Heron, for the London population. Heron concentrated his attention upon the relation of fertility in man to social status. He used as indices to social status such marks as the relative number of professional men in a community, or the relative number of servants employed, or of lowest type of male laborers, or of pawnbrokers; also the amount of child employment pauperism, overcrowding in the home, tuberculosis, and pauper lunacy. Twenty-seven metropolitan boroughs of London were canvassed on these bases, which are certainly significant, though not infallible, indices to the character of a community. His results are shown in the briefest possible form in Table III. TABLE III _Correlation of the Birth Rate with Social and Physical Characters of London Population._ (From Heron.)