ever remote they may seem from the random impulses to cry and clutch at random objects with which a baby comes into the world, must start from just such materials as these. The same impulse which prompts a five-year-old to put blocks into a symmetrical arrangement is the stuff out of which architects or great executives are made. Patriotism and public spirit find their roots back in the same unlearned impulses which make a baby smile back when smiled at, and makes it, when a little older, cry if left too long alone or in a strange place. All the native biological impulses, which are almost literally our birthright, may, when understood, be modified through education, public opinion, and law, and directed in the interests of human ideals.
It is the aim of this book to indicate some of these more outstanding human traits, and the factors which must be taken into account if they are to be controlled in the interests of human welfare. It is too often forgotten that the problems which are to be dealt with i