We now come to those other relative considerations which depend on each individual trying to eradicate, through the medium of another, his weaknesses, deficiencies, and deviations from the type, in order that they may not be perpetuated in the child that is to be born or develop into absolute abnormities.

More than even civilization itself, are at fault those pernicious abnormities, rare monstrosities, which are transmitted from generation to generation, or are also often newly developed and appear to belong to our civilization.