I noted two directions in which the scientific worker is seeking to advance. He is trying to give a more complete account of the actual detail of what is happening, and he is seeking wider and wider generalizations. As an observer, he must note what he observes, and, it would seem, omit nothing. But in seeking generalizations he must select, from among the features he observes, only those which he takes to be of general significance. Thence arises at least the appearance of a conflict in his activities. If he is too intent on the details of what he observes, his generalizations suffer; but if he leaves aside details too readily, his generalizations suffer equally. There is danger both in omitting and in not omitting.