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 ON THE NATUBE OF THE NOTION OF EXTERNALITY. 227 ing to wrestle with an opponent while our feet are in the air. The intelligence can no more hoist itself out of the intelligible world by any process of argument than the body can lift itself out of the material world. On the contrary, as I have already indicated, the very effort after absolute denial which the sceptic makes must tend to bring to light principles which his scepticism does not and cannot assail, principles which it seems able to assail only from a confusion of the universal with the particular, of the idea of truth with a particular truth." : Of these so-called principles (i.e., notions) the most fun- damental is the notion of externality. Thus the idealist is the person who most thoroughly conforms to Prof. Caird's conception of the " Sceptic ". 1 Prof. Caird's Critical Philosophy of Kant, i., 21.