In the universal use made of it, gesticulation has some analogy with logic and grammar, in that it has to do with the form, rather than with the matter of conversation; but on the other hand it is distinguishable from them by the fact that it has more of a moral than of an intellectual bearing; in other words, it reflects the movements of the will.  As an accompaniment of conversation it is like the bass of a melody; and if, as in music, it keeps true to the progress of the treble, it serves to heighten the effect.

In a conversation, the gesture depends upon the form in which the subject-matter is conveyed; and it is interesting to observe that, whatever that subject-matter may be, with a recurrence of the form, the very same gesture is repeated.  So if I happen to see—­from my window, say—­two persons carrying on a lively conversation, without my being able to catch a word, I can, nevertheless, understand the general nature of it perfectly well; I mean, the kind of thing that is being said and the form it takes.  There is no mistake about it.  The speaker is arguing about something, advancing his reasons, then limiting their application, then driving them home and drawing the conclusion in triumph; or he is recounting his experiences, proving, perhaps, beyond the shadow of a doubt, how much he has been injured, but bringing the clearest and most damning evidence to show that his opponents were foolish and obstinate people who would not be convinced; or else he is telling of the splendid plan he laid, and how he carried it to a successful issue, or perhaps failed because the luck was against him; or, it may be, he is saying that he was completely at a loss to know what to do, or that he was quick in seeing some traps set for him, and that by insisting on his rights or by applying a little force, he succeeded in frustrating and punishing his enemies; and so on in hundreds of cases of a similar kind.

Strictly speaking, however, what I get from gesticulation alone is an abstract notion of the essential drift of what is being said, and that, too, whether I judge from a moral or an intellectual point of view.  It is the quintessence, the true substance of the conversation, and this remains identical, no matter what may have given rise to the conversation, or what it may be about; the relation between the two being that of a general idea or class-name to the individuals which it covers.

As I have said, the most interesting and amusing part of the matter is the complete identity and solidarity of the gestures used to denote the same set of circumstances, even though by people of very different temperament; so that the gestures become exactly like words of a language, alike for every one, and subject only to such small modifications as depend upon variety of accent and education.  And yet there can be no doubt but that these standing gestures, which every one uses, are the result of no convention or collusion.  They are original and innate—­a true language of nature; consolidated, it may be, by imitation and the influence of custom.