An equally important, if not a more important, advance of kindred nature, is to be anticipated. The vocal signs of sentient states will simultaneously evolve further. Loudness of tone, pitch of tone, quality of tone, and change of tone, are severally marks of feeling; and, combined in different ways and proportions, serve to express different amounts and kinds of feelings. As elsewhere pointed out, cadences are the comments of the emotions on the propositions of the intellect[J]. Not in excited speech only, but in ordinary speech, we show by ascending and descending intervals, by degrees of deviation from the medium tone, as well as by place and strength of emphasis, the kind of sentiency which accompanies the thought expressed. Now the manifestation of feeling by cadence, like its manifestation by visible changes, is at present under restraint; the motives for repression act in the one case as they act in the other. A double effect is produced. This audible language of feeling is not used up to the limit of its existing capacity; and it is to a considerable degree misused, so as to convey other feelings than those which are felt. The result of this disuse and misuse is to check that evolution which normal use would cause. We must infer, then, that as moral adaptation progresses, and there is decreasing need for concealment of the feelings, their vocal signs will develop much further. Though it is not to be supposed that cadences will ever convey emotions as exactly as words convey thoughts, yet it is quite possible that the emotional language of the future may rise as much above our present emotional language, as our intellectual language has already risen above the intellectual language of the lowest races. A simultaneous increase in the power of interpreting both visible and audible signs of feeling must be taken into account. Among those around we see differences both of ability to perceive such signs and of ability to conceive the implied mental states, and their causes; here, a stolidity unimpressed by a slight facial change or altered tone of voice, or else unable to imagine what is felt; and there, a quick observation and a penetrating intuition, making instantly comprehensible the state of mind and its origin. If we suppose both these faculties exalted--both a more delicate perception of the signs and a strengthened constructive imagination--we shall get some idea of the deeper and wider sympathy that will hereafter arise. More vivid representations of the feelings of others, implying ideal excitements of feelings approaching to real excitements, must imply a greater likeness between the feelings of the sympathizer and those of the sympathized with; coming near to identity. By simultaneous increase of its subjective and objective factors, sympathy may thus, as the hinderances diminish, rise above that now shown by the sympathetic as much as in them it has risen above that which the callous show.