(externally stimulated), which admits at the same time of universal communication, can be concerned with nothing else than the proportion of the different degrees of the disposition (tension) of the sense, to which the sensation belongs, i.e. with its tone. In this far-reaching signification of the word it may be divided into the artistic play of the sensations of hearing and sight, i.e. into Music and the Art of colour. — It is noteworthy that these two senses, besides their susceptibility for impressions so far as these are needed to gain concepts of external objects, are also capable of a peculiar sensation bound up therewith, of which we cannot strictly decide whether it is based on sense or reflection.

This susceptibility may sometimes be wanting, although in other