283. Extension, considered in all its purity, as we imagine it in space, is the basis of geometry.
284. The same extension modified in various ways, and placed in relation with our sensibility, is the basis of all the natural sciences, of all those which have for their object, the corporeal universe.
285. Intelligence gives rise to ideology and psychology.
286. The will, in so far as moved by ends, gives rise to the moral sciences.
287. The idea of being begets the principle of contradiction; and, by this principle, the general and indeterminate ideas, whose combination produces ontology, which circulates, like a life-giving fluid, through all the other sciences.
288. Such I conceive the tree of human science: to examine its roots was the object of the Fundamental Philosophy.