text:  Do you allude sir to an eye which belongs to my visible body and forms a small part of the same; or do you allude to an eye which does not belong to my visible body and which constitutes no portion thereof? If the metaphysician should say that he refers to an eye of the latter description then the plain man's answer should be--that he has no experience of any such eye--that he cannot conceive it--that he knows nothing at all about it--and that the only eye which he ever thinks or speaks of is the eye appertaining to and situated within the phenomenon which he calls his visible body