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This work does not profess to be a treatiseon the subject of feeling, but merely aseries of studies, and rather tentative ones at that.I have attempted to deduce from the standpoint ofbiologic evolution the origin and development offeeling, and then to consider how far introspectionconfirms these results. I am well aware that Itraverse moot points—what points in psychologyare not moot?—and I trust that the position takenwill receive thorough criticism. I should be veryglad to have new facts adduced, whatever waythey may bear. I have no theory to defend,but the results offered are simply the best interpretationI have as yet been able to attain.<