"How" covers everything from the ingenious explanations of Sherlock Holmes to the discoveries of science and ways of teaching manners to children. Reading is pleasure of the mind, which means that it is a little like a sport: your eagerness and knowledge and quickness make you a good reader. Reading is fun, not because the writer is telling you something, but because it makes your mind work. Your own imagination works along with the author's or even goes beyond his. Your experience, compared with his, brings you to the same or different conclusions, and your ideas develop, as you understand his. Every book stands by itself, like a one-family house, but books in a library are like houses in a city. Although they are separate, together they all add up to something. They are connected with each other and with other cities.