knew all the mysteries of their craft. Then the mysteries grew more mysterious, and at last industry began to depend upon physical laws and chemical combinations that no eye could see, and only a trained mind could conceive. The scientist moved from his noble garret in the Latin Quarter into office buildings and laboratories. For he alone could construct a working image of the reality on which industry rested. From the new relationship he took as much as he gave, perhaps more: pure science developed faster than applied, though it drew its economic support, a great deal of its inspiration, and even more of its relevancy, from constant contact with practical decision. But physical science still labored under the enormous limitation that the men who made decisions had only their commonsense to guide them. They administered without scientific aid a world complicated by scientists. Again they had to deal with facts they could not apprehend, and as once they had to call in engineers, they now have to call in statisticians, accountants, experts of all sorts.
These practical students are the true pioneers of a new social science. They are "in mesh with the driving wheels"[1] and from this practical engagement of science and action, both will benefit radically: action by the clarification of its beliefs; beliefs by a continuing test in action. We are in the earliest beginnings. But if it is conceded that all large forms of human association must, because of
- ↑ Cf. The Address of the President of the American Philosophical Association, Mr. Ralph Barton Perry, Dec. 28, 1920. Published in the Proceedings of the Twentieth Annual Meeting.
