After a lifetime of combat, whether by fists or words, the jaw sets permanently a little more upward and outward--a little more like that of the bulldog. It keeps to this combative mold, "because," says Mother Nature, the great efficiency expert, "if you are going to call on me constantly to stiffen that jaw I'll fix it so it will stay that way and save myself the trouble." Inheritance of Acquired Traits Thus the more combative jaw, having become permanent in the man's organism, can be passed on to his children. Right here comes a most interesting law and one that has made possible the science of Human Analysis:
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