How to Analyze People on Sight

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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: