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Professor Pearson and his school of biometrics here ignore or at least fail to record one of those significant "correlations" which form the basis of his method.

Galton's biometrics and eugenics is a return to nature, a keen scrutiny of human beings, which is really an orderly fruition of that of the same author's "Art of Travel." Similarly, Mr. Weismann that he can plague his adversaries with the small but literal and concrete mice and hydroids and water fleas with which his theories began?

There would be X-ray machines and experts to radiograph the pituitary, pineal and thymus glands when possible. There would be psychologists to carry out intelligence tests, determine emotional reactions, and group mental aberrations, deficiencies and defectives. There would be statisticians, trained in biometrics, to criticize and compare data obtained.

To all these blunders and ignorances doctors are no less subject than the rest of us. They are not trained in the use of evidence, nor in biometrics, nor in the psychology of human credulity, nor in the incidence of economic pressure. Further, they must believe, on the whole, what their patients believe, just as they must wear the sort of hat their patients wear.

Of these and similar theories, all we can say is that if they are true, they are not so well substantiated as the ones we have reviewed at greater length. The task of experimental zoölogy is to work more extensively and deeply upon inheritance and variation, combining the methods and results of cellular biology, biometrics, and experimental breeding.

But when he attempts to show by the methods of biometrics that not only the first child but also the second, are especially liable to suffer from transmissible pathological defects, such as insanity, criminality and tuberculosis, he fails to recognize that this tendency is counterbalanced by the high mortality rate among later children.