"I'll tell you what, mate, there's just this difference between you and me in this matter," I heard Fleming remark; "you says a flying-machine can be made; so do I.  You may make fifty flying-machines, or a hundred, or five hundred for that matter, all different, and with all sorts of wheels, and cogs, and what not, which nobody can understand; but when they are made, what I have to ask you, mate, is, will they fly?  It's there you and I differ."