The second type of appreciation is appreciation of human nature: appreciation of the value of human life, appreciation of its virtues and trials, appreciation of great characters, and so on. Some writers would probably class this type of appreciation under moral feelings--but moral feelings usually are thought of as active, as accompaniments of conduct, whereas these appreciations are feelings aroused in the onlooker--they are passive and for the time being are an end in themselves. These feelings are stimulated by such studies as literature and history particularly. Geography and civics offer some opportunity for their development, and, of course, contact with people is the greatest stimulus. In this latter type of situation the feelings of appreciation easily pass over into active emotions, but so long as one remains an onlooker, they need not do so. This appreciation, sympathy with and enjoyment and approval of human nature, finds its source in the social instincts, but it needs development and training if it is to be perfected. Very much of the time this appreciation is inhibited by the emphasis put on understanding. The intellectual faculties of memory, judgment, and criticism are the ones called into play in the study of history and often of literature. These studies leave the learner cold. He knows, but it does not make any difference to him. He can analyze the period or the character, but he lacks any feeling response, any appreciation of the qualities of endurance and loyalty portrayed, lacks any _sympathetic_ understanding of the difficulties met and conquered. As was true of the aesthetic appreciation, a certain amount of understanding is necessary for true appreciation of any kind, but overemphasis of the intellectual element destroys the feeling element. The third type of appreciation to be discussed is the appreciation of humor. Perhaps this does not belong with the other type, but it certainly has many of the same characteristics. Calkins defines a sense of humor as "enjoyment of an unessential incongruity.... This incongruity must be, as has been said, an unessential one, else the mood of the observer changes from happiness to unhappiness, and the comic becomes the pathetic. A fall on the ice which seemed to offer only a ludicrous contrast between the dignity and grace of the man erect and the ungainly attitude of the falling figure ceases utterly to be funny when it is seen to entail some physical injury; and wit which burns and sears is not amusing to its victim."[12] The ability to appreciate the humorous in life is a great gift and should be cultivated to a much greater extent than it is at present.