In the selection of pleasures and the cultivation of tastes much wisdom is shown in choosing in such a way that each should form a complement to the others; that different pleasures should not clash, but rather cover different areas and seasons of life; that each should tend to correct faults or deficiencies of character which the others may possibly produce. The young man who starts in life with keen literary tastes and also with a keen love of out-of-door sports, and who possesses the means of gratifying each, has perhaps provided himself with as many elements of happiness as mere amusements can ever furnish. One set of pleasures, however, often kills the capacity for enjoying others, and some which in themselves are absolutely innocent, by blunting the enjoyment of better things, exercise an injurious influence on character. Habitual novel-reading, for example, often destroys the taste for serious literature, and few things tend so much to impair a sound literary perception and to vulgarise the character as the habit of constantly saturating the mind with inferior literature, even when that literature is in no degree immoral. Sometimes an opposite evil may be produced. Excessive fastidiousness greatly limits our enjoyments, and the inestimable gift of extreme concentration is often dearly bought. The well-known confession of Darwin that his intense addiction to science had destroyed his power of enjoying even the noblest imaginative literature represents a danger to which many men who have achieved much in the higher and severer forms of scientific thought are subject. Such men are usually by their original temperament, and become still more by acquired habit, men of strong, narrow, concentrated natures, whose thoughts, like a deep and rapid stream confined in a restricted channel, flow with resistless energy in one direction. It is by the sacrifice of versatility that they do so much, and the result is amply sufficient to justify it. But it is a real sacrifice, depriving them of many forms both of capacity and of enjoyment.