It does not, however, seem probable that the earliest words were mere _imitations_ of the sounds produced by the objects they designed to express, such as are some of the words of child-language whereby dogs are called _bow-wows_ and lambs are called _baas_. Nor need we wonder at this, when we note the principles upon which other sorts of _language_--expressive actions, for instance--are conceived and used. If we intend to express the idea of motion by an expressive gesture, we do not make any copy of the mode of that motion. We say ‘Go,’ and we dart out our hand, half to show that the person we are addressing is to go in the direction which we point out, or that he is to keep away from us; half, again, to give the idea of his movement by the rapidity of our own. But if we wanted to convey this last idea by mere imitation we should move our legs rapidly and not our arms.
It might be thought that the study of the gesture-language which has been used by men, especially the gesture-language of deaf-mutes, who have no other, would give us the best insight into the origin of language among mankind. But in reality the results of such a study are not very satisfactory; and for this reason, that the deaf-mute has in every case been in contact with one or more persons who possessed speech, and whose ideas were therefore entirely formed by the possession and the inheritance of language. This inherited language they translate into signs for the benefit of the deaf-mute, while the latter is still a baby and incapable of inventing language; wherefore it, in its turn, _inherits_ a language almost as much as its parent has done, though it is a language of gesture and not of spoken words.[19] It is a fact, however, that deaf-mutes who cannot hear the sounds they make, do nevertheless articulate certain _sounds_ which they constantly associate with the same ideas. These seem to bring us very near the language-making faculty of man. Lists of these sounds have been made, but they are not such that we can draw any conclusions touching the natural or universal association of sound and sense.
[Sidenote: Growth of the ‘insignificant’ words out of the ‘significant.’]
The origin of human speech and the mode of its first operation are therefore undiscoverable. We can place no measure to the rapidity with which the first created man may have obtained his stock of words of our first class; as Adam is described naming each one of the animals among whom he lived. All these beginnings lie beyond the ken of linguistic science. But even when he was furnished as fully as we choose to suppose with a class of words which had a meaning of their own, there was still the second class whose invention must have followed upon the invention of the first. The adverbs, prepositions, conjunctions, particles,--the words which meant _to_, _and_, _at_, _but_, _when_,--these we have already seen must as a whole have come into use later than the other class of words.