Sách nói: Five Lectures on Blindness

The [five] 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. . . 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 seeing public, for the benefit that will accrue to the blind from a better understanding of their problems.

(Extract from the Forward by Milton J. Ferguson)