Strange but credible manners and customs of the cave-men are detailed.

They live in picturesque caves.
Their half-monkey gestures are wonderful to see.

But these things are beheld on the fly.

It is the chronicle of a race between the brain of Weak-Hands and the body of the other, symbolized by the chasing of poor Weak-Hands in and out among the rocks until the climax.

Brain desperately triumphs.