For the present book the following claims may be made. First, it is a modern book; its writer watches hour by hour the new achievements of the human mind, he reaches out for information about them, he seeks to adjust his own thoughts to them and to test them in his own living. Second, it is, or tries hard to be, a wise book; its writer is not among those too-ardent young radicals who leap to the conclusion that because many old things are stupid and tiresome, therefore everything that is old is to be spurned with contempt, and everything that proclaims itself new is to be taken at its own valuation. Third, it is an honest book; its writer will not pretend to know what he only guesses, and where it is necessary to guess, he will say so frankly. Finally, it is a kind book; it is not written for its author's glory, nor for his enrichment, but to tell you things that may be useful to you in the brief span of your life. It will attempt to tell you how to live, how to find health and happiness and success, how to work and how to play, how to eat and how to sleep, how to love and to marry and to care for your children, how to deal with your fellow men in business and politics and social life, how to act and how to think, what religion to believe, what art to enjoy, what books to read. A large order, as the boys phrase it! There are several ways for such a book to begin. It might begin with the child, because we all begin that way; it might begin with love, because that precedes the child; it might begin with the care of the body, explaining that sound physical health is the basis of all right living, and even of right thinking; it might begin as most philosophies do, by defining life, discussing its origin and fundamental nature. The trouble with this last plan is that there are a lot of people who have their ideas on life made up in tabloid form; they have creeds and catechisms which they know by heart, and if you suggest to them anything different, they give you a startled look and get out of your way. And then there is another, and in our modern world a still larger class, who say, "Oh, shucks! I don't go in for religion and that kind of thing." You offer them something that looks like a sermon, and they turn to the baseball page.