It is little enough we know and the rest is darkness.
3. PREHISTORIC MAN
PREHISTORIC MAN BEGINS TO MAKE THINGS FOR HIMSELF
EARLY man did not know what time meant. He kept no records of birthdays or wedding anniversaries or the hour of death. He had no idea of days or weeks or even years. But in a general way he kept track of the seasons for he had noticed that the cold winter was invariably followed by the mild spring—that spring grew into the hot summer when fruits ripened and the wild ears of corn were ready to be eaten and that summer ended when sudden gusts of wind swept the leaves from the trees and a number of animals were getting ready for the long hibernal sleep.