text:  For when he proceeds to the discussion of the _second_ of the two questions he remarks that "we must _at this stage_ of the argument consider the theory under examination as representing that we see all things _originally in the same plane_ "[32] obviously implying that he had not _as yet_ considered the theory as representing that we see things originally in the same plane: in other words plainly admitting that in his treatment of the first question he had not regarded the theory as representing that we see things originally under the category of extension at all