In this family nineteen out of twenty-six descendants were deaf, and it is interesting to note that, although one of the members of the family was a hearing person, and married a hearing husband (Reed), their two children and three grandchildren were all deaf. One of the descendants, No. l, was deaf and married a deaf-mute, but their five children all hear. No one could refer to this branch of the family as a proof that deafness is not hereditary, however.
The diagram on the following page shows the genealogy of the Fullerton family, of Hebron, New York:
Fullerton had seven children, all deaf and dumb. There is no further information about six of these children or their descendants; but the seventh, Jane Fullerton (1), married Sayles Works (2), who was also a deaf-mute, and all their six children were deaf and dumb. No information was obtained regarding the descendants of these six children.
Those persons who are not familiar with logical reasoning will point to married deaf-mutes with hearing children as proof that such marriages are not to be condemned; but, in order to prove that deafness is hereditary, it is not necessary to show that all the children of deaf parents are deaf, but only that the number of deaf children,