Conversely, the power of continued application, which in the primitive man is very small, has among ourselves become considerable. It is true that most are coerced into industry by necessity; but there are sprinkled throughout society men to whom active occupation is a need--men who are restless when away from business and miserable when they eventually give it up; men to whom this or that line of investigation is so attractive that they devote themselves to it day after day, year after year; men who are so deeply interested in public affairs that they pass lives of labor in achieving political ends they think advantageous, hardly giving themselves the rest necessary for health. Yet again, and still more strikingly, does the change become manifest when we compare undeveloped with developed humanity in respect of the conduct prompted by fellow-feeling. Cruelty rather than kindness is characteristic of the savage, and is in many cases a source of marked gratification to him; but though among the civilized are some in whom this trait of the savage survives, yet a love of inflicting pain is not general, and besides numbers who show benevolence, there are those who devote their whole time and much of their money to philanthropic ends, without thought of reward either here or hereafter. Clearly these major, along with many minor, changes of nature, conform to the law set forth. Activities appropriate to their needs which give pleasures to savages have ceased to be pleasurable to many of the civilized; while the civilized have acquired capacities for other appropriate activities and accompanying pleasures which savages had no capacities for.