Hearing.
The sense of hearing is one more connected with the intellectual and moral powers of man than either taste or smell, as it is through the medium of this organ that both music and speech operate on the human mind. We can form some imperfect estimate of the amount of happiness derived from this sense by imagining the condition of mankind were they at once and forever deprived of this source of improvement and enjoyment. The voice of sympathy, friendship, and love would be hushed. The eloquence of the forum, the debates of the Legislature, the instructions of the pulpit, would cease. The music of nature—its sighing winds and dashing waters—would be stilled, and the warbling of the groves would charm no more. The sound of pipe, and harp, and solemn harmonies of voice would never again waken the soul to thrilling and nameless emotions. Where now ten thousand sounds of active life, or cheerful hum of business, or music of language and song charm and animate the soul, man would walk forth in silence and solitude.
The operation of mere sound, disconnected with the ideas which are often conveyed by it, is a subject of curious speculation. Sounds differ from each other in quality, pitch, force, and in length. The difference in tone may be illustrated by the sounds of a clarionet compared with the sound of a bell or of the human voice. Every instrument and every human voice has each a peculiar tone by which it is distinguished from all others. The difference in pitch is shown by sounding a low and a high note in succession on an instrument. The difference in force is exhibited by singing or speaking loud or soft.
There are certain sounds that in themselves are either agreeable or disagreeable from their tone alone. Thus the sound of a flute is agreeable, and that of the filing of a saw is disagreeable. Sounds also are agreeable according as they succeed each other.
Melody is a succession of agreeable tones arranged in some regular order as it respects their duration and succession. Some melodies are much more agreeable to the ear than others. Some melodies produce a plaintive state of mind, others exhilarate, and this without regard to any thing except the nature of the sounds and their succession. Thus a very young infant, by a certain succession of musical tones, can be made either to weep in sorrow or smile with joy.
Harmony is a certain combination of sounds which are agreeable to the ear; and it is found that the mind can be much more powerfully affected by a combination of harmonious sounds than by any melody. The effect of music on certain minds is very powerful, often awakening strange and indescribable emotions. It has been, therefore, much employed both to heighten social, patriotic, and devotional feeling.
There is probably nothing which produces stronger and more abiding associations in the mind than musical sounds. As an example of this may be mentioned the national air which is sung by the Swiss in their native valleys. It is said that when they become wanderers in foreign lands, so strongly will this wild music recall the scenes of their childhood and youth, their native skies, their towering mountains and romantic glens, with all the strong local attachments that gather around such objects, that their heart sickens with longing desires to return. And so much was this the case with the Swiss of the French armies, that Bonaparte forbade this air being played among his troops. The Marseilles Hymn, which was chanted in the scenes of the French Revolution, was said to have been perfectly electrifying, and to have produced more effect than all the eloquence of orators or machinations of statesmen.
The mind seems to acquire by experience only the power of determining the place whence sounds originate. It is probable that, at first, sounds seem to originate within the ear of the person who hears; and, even after long experience, cases have been known, when a person suddenly waked from sleep imagined the throbbing of his own heart was a knocking at the door. But observation and experience soon teach us the direction and the distance of sounds. The art of the ventriloquist consists in nothing but the power which a nice and accurate ear gives him of distinguishing the difference between sounds when near or far off, and of imitating them.
Touch.
The sense of touch is not confined to one particular organ, but is extended over the whole system, both externally and internally. It is in the hands, however, especially at the ends of the fingers, that this sense is most acute and most employed. We acquire many more ideas by the aid of this sense than by either hearing, smell, or taste. By these last we become acquainted with only one particular quality in a body, either of taste, smell, or sound; but by means of the touch we learn such qualities as heat and cold, roughness and smoothness, hardness and softness, figure, solidity, and extension.