contain an exact solution of all the particular cases.
“As to forms, and hues, and magnitudes, and weight, and the other qualities which one looks upon as attributes, whether it be of every body, or of those bodies only which are visible and perceived by the senses, this is the point of view under which they ought to be considered: they are not particular substances, having a peculiar existence of their own, for that cannot be conceived; nor can one say any more that they have no reality at all. They are not incorporeal substances inherent in the body, nor are they parts of the body. But they constitute by their union the eternal substance and the essence of the entire body. We must not fancy, however, that the body is composed of them, as an aggregate is formed of particles of the smallest dimensions of atoms or magnitudes, whatever they may be, smaller than the compound body itself; they only constitute by their union, I repeat, the eternal substance of the body. Each of these attributes has ideas and particular perceptions which correspond to it; but they cannot be perceived independently of the whole subject taken entirely; the union of all these perceptions forms the idea of the body. Bodies often possess other attributes which are not eternally inherent in them, but which, nevertheless, cannot be ranged among the incorporeal and invisible things. Accordingly, it is sufficient to express the general idea of the movement of transference to enable us to conceive in a moment certain distinct qualities, and those combined beings, which, being taken in their totality, receive the name of bodies; and the necessary and eternal attributes without which the body cannot be conceived.
“There are certain conceptions corresponding to these attributes; but, nevertheless, they cannot be known abstractedly, and independently of some subjects; and further, inasmuch as they are not attributes necessarily inherent in the idea of a body, one can only conceive them in the moment in which they are visible; they are realities nevertheless; and one