The intermediate character is shown especially in the head form.

If an ape, Pithecanthropus had an enormous brain; if a man, he must have verged on what we should consider idiocy.
Also standing somewhat by itself is the Heidelberg man.

All that we have of him is a well-preserved lower jaw with its teeth.

It was found more than eighty feet below the surface of the soil, in company with animal remains that make it possible to fix its position in the scale of pre-historic periods with some accuracy.

Judged by this test, it is as old as the oldest of the unmistakable drift implements, the so-called Chellean (from Chelles in the department of Seine-et-Marne in France).