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One, the manifestations of functional capacities which are themselves dependent upon structural differences. I am not talking now of psychogenetic determinants, but alone of the trends of which Dr. Putnam has spoken. Is he not assuming the contrary to Darwin when he says that function precedes structure? Are not the potentials dependent upon the variation which has determined this function?

Here one has to proceed from an initial point hardly discernible, and step by step, discover the way of ascent; thus the psychological method becomes at the same time a psychogenetic method. The main condition is that both methods be held sufficiently apart in order that the conclusions of both may not flow together, and yet may form a fruitful completion."

Now physiological discomfort is an experience universal at one time of life or another; but the reaction to it is infinite in variety; and while part of it depends upon the congenital dispositions which are the common property of humanity, a larger part is contingent upon the psychogenetic factors which have stamped the individual.

The science of conditionable reactions of cerebrate animals is called psychology, and the means by which the reactions are influenced are called psychogenetic, whether these are healthy or diseased.