Nor do the evidences of race-history as revealed by the child cease with its birth. The babe is nearer the lower mammals than is the adult man. When it acquires the use of its limbs it begins life as a quadruped. Its blundering attempts in learning to stand erect and walk is evidence of the fact that man’s peculiar mode of locomotion is a late acquirement. Like the lower animals the babe makes known its wants by means of natural language; it later acquires artificial or spoken language in the same slow, laborious way that it was acquired by the race. At the average age of three years the child has become self-conscious; his mind has passed the mental stage of all animals below man. Psychically he has become man. In certain periods of youth the child is a tree-climber, a cave-digger, childish sports that hark back to periods passed through hundreds of thousands of years ago in the childhood of the race. At a certain stage his emotional nature has developed to the point that he is conscious of wrong-doing. This is what the old theologians called “the age of accountability.” If there is a grain of truth in the chaff-heap of Mosaic mythology the fall of Adam indicates the point in the development of the race when conscience had dawned and feelings of remorse had begun to stir within. Man had reached the age of accountability. But prior to the “fall” there was a rise. Rudiments or vestiges are also evidences of the descent (or ascent) of the higher forms of life from the lower. Rudiments are incomplete parts of the body which have become arrested in their development, and which are now of no use, nor would now be of use if fully developed. They are relics handed down to us by the laws of heredity from a long-past age when they were well developed and useful to our lowly ancestors. Though we outgrow primitive conditions and stages of development we can not get rid of the past, but must drag it around with us as the snail drags its shell. All the higher animals bear within their bodies the reminders of a humble origin, some of which are: The incisor teeth of certain grass-eating animals, so rudimentary as never to cut through; the small hoof points of the cow which do not touch the ground, and the rudimentary fifth and sixth teats on the hinder part of her udder; the splint bones in the horse’s leg--vestiges of toes when he was a three-toed animal; the scanty, downy hair that covers the human body.