John Harvey Kellogg,
Plain Facts for Old and Young
“ Persons suffering with serious congenital defects, as natural blindness, deafness, deformity of the limbs, or defective development of any part, will be more or less likely to transmit the same deformities or deficiencies to their children. There are, of course, cases of natural blindness, as well as of disability in other respects, to which this rule does not apply, the natural process of development not being seriously defective. ”
