The author, whose previous compilation entitled "The Deaf" is well known, has now prepared this work of reference on conditions of the blind in the United States. The first part is general, giving statistics, compilations of judicial decisions and statements regarding the economic condition of the blind, and the cost of this deformity to the state. The second part deals with the prophylaxis of blindness and quotes freely from well-recognized statistics as to various causes. It takes up the general subject of heredity in its relation to loss of sight, follows with a discussion of trachoma, ophthalmia neonatorum and other diseases, and then considers blindness, accidents and methods of prevention. In one chapter of this part of the book the author demonstrates that blindness has, within a measurable time, shown on the whole a decrease, although not a material one, and that the chances are that the decline will continue.