594. Have animals a language?
"If you mean a language formed of words and syllables, no; but if you mean a method of communication among themselves, yes. They say much more to one another than you suppose; but their language is limited, like their ideas, to their bodily wants."
-- There are animals who have no voice; have they no language?
"They understand one another by other means. Have men no other method of communicating with one another than by speech? And the dumb, what do you say of them? The animals, being endowed with the life of relation, have means of giving one another information, and of expressing the sensations they feel. Do you suppose that fishes have no understanding among themselves? Man has not the exclusive privilege of language; but that of the animals is instinctive and limited to the scope of their wants and ideas, while that of man is perfectible, and lends itself to all the conceptions of his intelligence."
It is evident that fishes, emigrating in masses, like the swallows that follow the guide that leads them, must have the means of giving one another information, of arriving at a common understanding, and of concerting measures of general interest. It may be that they are gifted with a sense of vision sufficiently acute to allow of their distinguishing signs made by them to one another, or the water may serve them as a vehicle for the transmission of certain vibrations. It is evident that they must have some means, whatever these may be, of comprehending one another, like all other animals that have no voice, and that nevertheless perform actions in common. Should it, then, be deemed strange that spirits are able to communicate among themselves without having recourse to articulate speech? (See 282.)