The following lectures were written primarily to be delivered at the summer sessions of the University of California, at Berkeley and at Los Angeles, in the summer of 1918. We are printing them, however, so that the information in them can be more widely distributed, since they are the outgrowth of almost a quarter of a century spent in work for the blind, and were written from the standpoint of a blind person, seeking to better the condition of the blind. They were addressed not to the blind, but to the se