heredity, and the constancy of its action, as well as its
controllability
These discoveries changed the whole current of thought regarding
heredity, and the constancy of its action, as well as its
controllability. It also emphasized the fact that it does make a
difference whom one marries as to the character of the resulting
offspring. Their makeup is not subject to the caprice of forces beyond
human perception, but is in some degree subject to control.
