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The Quaternary Period; The Stone Age

From the text:

"Yes," he continued, with renewed animation, "this is a fossil man, a contemporary of the mastodons, with the bones of which this whole amphitheater is covered. But if I am called on to explain...

In my opinion, he believes that it is a politician's word because its true meaning is ambigious and open to interpretation.

Have I rehabilitated myself, you ask? I don't even know what that word means, at least as far as prisons and corrections...

Give me plot summary of mine boy novel in simple words