Thus, seeing water at this instant, it is an unquestionable truth to me that water doth exist: and remembering that I saw it yesterday, it will also be always true, and as long as my memory retains it always an undoubted proposition to me, that water did exist the th of July, as it will also be equally true that a certain number of very fine colours did exist, which at the same time I saw upon a bubble of that water: