"Thus the evidence given by those five new thigh bones of the morphological and functional distinctness of Pithecanthropus erectus furnishes proof, at the same time, of its close affinity with the gibbon group of anthropoid apes."

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If Thought is capable of being classed with Electricity, or Will with chemical affinity, as a mode of motion, it seems necessary to fall at once under the second law of thermodynamics as one of the energies which most easily degrades itself, and, if not carefully guarded, returns bodily to the cheaper form called Heat. Of all possible theories, this is likely to prove the most fatal to Professors of History.

— Henry Adams