 Given this foundation in “pure natural science”, Kant then reconstructs Newton’s “deduction from the phenomena” of the law of universal gravitation as follows. We begin, following Newton, from the observable “phenomena” described by Kepler’s “rules”. These “phenomena”, in Kant’s terminology, are so far mere “appearances [Erscheinungen]”, which have not yet attained the status of “experience  [Erfahrung]”.[36]  Then, again simply following Newton, we can use the law of inertia to derive (purely mathematically) inverse-square accelerations of their satellites directed towards every primary body in the solar system. Once we have done this, however, we can now, from Kant’s point of view, frame all of Newton’s explicitly inductive steps within the a priori “special metaphysics” of nature developed in the Metaphysical Foundations. By demonstrating a priori his three “laws of mechanics” corresponding to the three Analogies of Experience, Kant establishes that Newton’s three “Axioms or Laws of Motion” are synthetic a priori truths (compare notes  12  and  32  above). Further, by identifying the accelerations in question as effects of what Kant calls the fundamental force of attraction, it now follows from Kant’s “special metaphysics” of (material) nature that these accelerations must hold immediately between each part of matter and every other part of matter—and, accordingly, are also directly proportional to the  mass.[37]