Physical PART is that which, though it enter into the composition of a whole, may yet be considered apart, and under its own distinct idea; and in this sense a continuum is said to consist of parts. Physical parts, again, are of two kinds, homogeneous and heterogeneous. The first are those of the same denomination with some other; the second are of a different denomination. Parts, again, are distinguished into subjective, essential, and integrant; a division of which the schoolmen were likewise the authors.