No one will deny that, as seen from one angle science is a pursuit, an enterprise--a mode of practice. It is at least that, no matter how much more or else it is. In course of the practice of knowing distinctive practical judgments will then naturally be made. Especially does this hold good when an intellectual class is developed, when there is a body of persons working at knowing as another body is working at farming or engineering. Moreover, the instrumentalities of this inquiring class gain in importance for all classes in the degree in which it is realized that success in the conduct of the practice of farming or engineering or medicine depends upon use of the successes achieved in the business of knowing. The importance of the latter is thrown into relief from another angle if we consider the enterprises, like diplomacy, politics, and, to a considerable extent, morals, which do not acknowledge a thoroughgoing and constant dependence upon the practice of science. As Hobbes was wont to say, the advantages of a science of morals are most obvious in the evils which we suffer from its lack. To say that something is to be learned, is to be found out, is to be ascertained or proved or believed, is to say that something is to be done. Every such proposition in the concrete is a practical proposition. Every such proposition of inquiry, discovery and testing will have then the traits assigned to the class of practical propositions. They imply an incomplete situation going forward to completion, and the proposition as a specific organ of carrying on the movement. I have not the intention of dwelling at length upon this theme. I wish to raise in as definite and emphatic a way as possible a certain question. Suppose that the propositions arising within the _practice_ of knowing and functioning as agencies in its conduct could be shown to present all the distinctions and relations characteristic of the subject-matter of logic: what would be the conclusion? To an unbiased mind the question probably answers itself: All purely logical terms and propositions fall within the scope of the class of propositions of inquiry as a special form of propositions of practice. My further remarks are not aimed at _proving_ that the case accords with the hypothesis propounded, but are intended to procure hospitality for the hypothesis.