The word part is one which is often used extremely vaguely in philosophy; and I can imagine that some people would be willing to assent to the proposition that this sense datum really is, in some sense or other, a part of this inkstand, and that what I am judging with regard to it, when I judge This is an inkstand, is, in effect, There is an inkstand, of which this is a part, who would be far from allowing that this can possibly be what I am judging, when once they understand what the sense is in which I am here using the word part.