How to Analyze People on Sight

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But wherever you see a large protruding jaw you see an individual
"armed and engined," as Kipling says, for some kind of fighting. The
large jaw always goes with a combative nature, whether it is found on a
man or a woman, a child, a pugilist or a minister.


Exhibit A--The Irishman

The large jaw, therefore, is seen to be both a result and a cause of
certain things. As the inheritance of a fighting ancestor it is the
result of millions of years of fighting in prehistoric times, and, like
any other over-developed part or organ, it has an intense urge to
express itself. This inherent urge is what makes the owner of that jaw
"fight at the drop of the hat," and often have "a chip on his shoulder."


Natural Selection