It may be suggested, next, that these sources, instead of being something spiritual in their nature or something of a nature utterly unknown, consist simply of sensibles, of a kind which I have previously tried to define; namely of all those sensibles, which anybody would, under the actual physical conditions, experience in sensations proper of which the half crown and the florin were the source, if their bodies were in any of the positions relatively to those coins, in which they would get sensations from them at all.