Memoir upon the formation of a deaf variety of the human race.

Bell determined that deafness was an inheritable trait and that deaf individuals had a tendency to marry other deaf individuals. As a eugenicist Bell considered this a problem because he thought it risked the development of a "deaf variety" of humans. He suggested both "repressive" and "preventive" measures for mitigating this tendency. Digital facsimile from Google Books at this link.