In 1892 I was asked by the Harvard Corporation to give a few public lectures on psychology to the Cambridge teaca teachers. The talks now printed form the substance of that course, hers. which has since then been delivered at various places to variwhich various teacher-audiences. I have found by experience that what ous my hearers seem least to relish is analytical technicality, and what they most care for is concrete practical application. So I have gradually weeded out the former, and left the latter unreduced; and now, that I have at last written out the lecunreduced; lectures, they contain a minimum of what is deemed lsquo;scientific tures, in psychology, and are practical and popular in the extreme.