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are of inestimable value as being almost invariably to be depended upon. The fact should incite further research, but this is difficult. No doubt, the records kept. at the "Mother's Clinic" will in time lead to much valuable information.

If I feel bound to make one or two reservations, which in any case are only my personal views and do not concern the main arguments of the book, I hope that they may be taken rather as evidence of the sincerity of my appreciation of the work as a whole.

As a physiologist, I could wish that stronger evidence were to be obtained of the absorption by the one sex of the secretory products of the other sex. It must be admitted, however, that the evidence given is very strong and that cogent proof is difficult.

The other point is that it seems to me that it is unwise in the present state of knowledge to suggest, as appears to have been done, anything further than a limitation of the increase in stocks known to be bad, such as those with hereditary disease of body or mind. Unfortunately, the worst difficulty is with the mentally defective. In any case, such bad stocks are to be found in all classes of society. It is a