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Rh successive stages in that evolution of knowledge which we have just been discussing. It remains to say a few words upon subject matter as social, since our prior remarks have been mainly concerned with its intellectual aspect. A difference in breadth and depth exists even in vital knowledge; even in the data and ideas which are relevant to real problems and which are motivated by purposes. For there is a difference in the social scope of purposes and the social importance of problems. With the wide range of possible material to select from, it is important that education (especially in all its phases short of the most specialized) should use a criterion of social worth.

All information and systematized scientific subject matter have been worked out under the conditions of social life and have been transmitted by social means. But this does not prove that all is of equal value for the purposes of forming the disposition and supplying the equipment of members of present society. The scheme of a curriculum must take account of the adaptation of studies to the needs of the existing community life; it must select with the intention of improving the life we live in common so that the future shall be better than the past. Moreover, the curriculum must be planned with reference to placing essentials first, and refinements second. The things which are socially most fundamental, that is, which have to do with the experiences in which the widest groups share, are the essentials. The things which represent the needs of specialized groups and technical pursuits are secondary. There is truth in the saying that education must first be human and only after that professional. But those who utter the saying frequently have in mind in the term human only a highly specialized class: the class of learned men who preserve the classic traditions of the past. They forget that material is humanized in the degree in which it connects with the common interests of men as men.

Democratic society is peculiarly dependent for its maintenance upon the use in forming a course of study of criteria Q