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CH. II.] perishable. Thus, it is manifest, from what has been adduced, that the other parts of the Vital Principle are not, as some say, distinct from the body, although it is clear that, when considered absolutely, they are different from it; for the mode of being in a sentient must differ from that in a cogitative being, since feeling differs from thinking, and this applies equally to other functions and faculties. All those faculties besides belong to some animals, particular ones only to others, and there are others to which one only has been allotted, and this constitutes distinctions among animals, the cause of which shall hereafter be considered. But something very like this has taken place with respect to the senses, for some animals have them all; others have particular ones only, and there are others again which have but one; but that one is Touch, which of all is the most necessary.

As that by which we live and feel, like that by which we understand, has a twofold signification, since we speak of that by which we understand sometimes as Knowledge, and sometimes as the Vital Principle, for we say that we understand by either of them ; so equally does this apply to that by which we are in health, and which sometimes refers to a particular part of the body, and sometimes to the whole body. Now, the two faculties alluded to,