When we speak of man, we have a conception of humanity as a whole, and before applying scientific methods to the investigation of his movement, we must accept this as a physical fact. But can any one doubt to-day that all the millions of individuals and all innumerable types and characters constitute an entirety, a unit? Though free to think and act, we are held together, like the stars in the firmament; with ties inseparable. These ties we cannot see, but we can feel them