The course of human history is determined, not by what happens in the skies, but by what takes place in our hearts. - Arthur Keith

Now we proceed to consider the oldest race of great stature that has yet been discovered, one which flourished in the south of France when the last of the cold periods was lifting from Europe. The first examples of this race were discovered in 1868, when a railway was being constructed in the valley of the Vézère, a tributary of the Dordogne. A cutting made in the débris at the foot of the limestone cliffs which flank the valley of the Vézère at Cro-Magnon, brought to light the skeletons of a man, of a woman, and part of the skull of a third individual. Hence this ancient type or race is usually named Cro-Magnon.

From what we know of living anthropoids, we may infer that the chief mental activities of the group will be three in number—namely, those concerning with mating, maternity, and social behaviour. Each group will be attached to a territory and maintain its isolation.

In all the medical schools of London a notice is posted over the door leading to the dissecting room forbidding strangers to enter. I propose, however, to push the door open and ask the reader to accompany me within, for, if we are to understand the human body; it is essential that we should see the students at work.