HOW IS PURE MATHEMATICS POSSIBLE?
[SECOND PART OF THE TRANSCENDENTAL PROBLEM.]
HOW IS THE SCIENCE OF NATURE POSSIBLE?
[THIRD PART OF THE MAIN TRANSCENDENTAL PROBLEM.]
HOW IS METAPHYSICS IN GENERAL POSSIBLE?
SOLUTION OF THE GENERAL QUESTION OF THE PROLEGOMENA, "HOW IS METAPHYSICS POSSIBLE AS A SCIENCE?"
ON WHAT CAN BE DONE TO MAKE METAPHYSICS ACTUAL AS A SCIENCE.