When we speak of a science, we have in mind a logically body of knowledge that has resulted from certain methods attacking the problems presented by a particular subject. The methods of science are all, in the last resort, observational problems of science are all, in the last resort, analytical. matter of a given science may be indicated in two different ways: by a simple enumeration of objects, or by a characterization of the point of view from which the science in question regards common subject-matter of all science, namely, human experience.