Three kinds of books there are. First, those that give nothing and from which we demand nothing. These constitute the greater portion of the book-world; empty entertainment for the idle. Secondly, those books that give the unfamiliar and are unfamiliar to us--that is, demand only our memory. These are manuals of instruction presenting facts. And thirdly, those books that give themselves and demand ourselves. These are the books that are mental nutriment in the real sense of the words, and impart to the entire process of mental development a stimulus which, like the stimulus imparted to a growing tree, never again can be lost. The present book makes claim to belong to the last category. As so…
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