authority of science in the determination of the ultimate categories of explanation. We are then led to consider the natural reaction of men with a useful methodology against any evidence tending to limit the scope of that methodology. Science has always suffered from the vice of overstatement. In this way conclusions true within strict limitations have been generalized dogmatically into a fallacious universality.
This pragmatic function of Reason provides the agency procuring the upward trend of animal evolution. But the doctrine of the upward trend equally requires explanation in the purely physical cosmos. Our scientific formulation of physics displays a limited universe in process of dissipation. We require a counter-agency to explain the existence of a universe in dissipation within a finite time. The analogy of the animal body suggests that the extreme rejection of final causation from our categories of explanation has been fallacious. A satisfactory cosmology must explain the interweaving of efficient and of final causation. Such a cosmology will obviously remain an explanatory arbitrariness if our doctrine of the two modes of causation takes the form of a mere limitation of the scope of one mode by the intervention of the other mode. What we seek is such an explanation of the metaphysical nature of things that everything determinable by efficient causation is thereby determined, and that everything determinable by final causation is thereby determined. The two spheres of operation should be
