I have observed that signs prevail to a great extent among ants. Some years ago I had an opportunity of studying a colony of ants, and I watched them almost daily for several weeks. I had seen it stated that they found their way by the sense of smell, but these observations confirmed my doubts on that point, and I feel justified in saying that they are guided almost, if not entirely, by landmarks. On the bark of a tree from which they were gathering in their winter stores, I observed that there were certain little knots or protuberances by which they directed their course and which they always passed in a certain order. Between these landmarks they did not confine themselves to any exact path, but the concourse would sometimes widen out over the space of more than an inch, but as they approached a landmark every ant fell into line and went in the exact path of the others, which rarely exceeded in any case more than an eighth of an inch in width. Whenever an ant would lose its way it would lift its head high into the air, look around, and then turn almost at right angles from the course it was pursuing towards the path of the others. In scores of cases I observed that the outward-bound ant, when it had been lost and returned to the path, always came on the homeward side of the landmark and passed out. On the other hand, if a homeward-bound ant was lost it would approach from the outward side of the landmark and pass in. About five feet from the ground were two small, round knots, about one-eighth of an inch in height, and a space between them of about the same width. This appeared to be one of their most conspicuous and reliable landmarks, and every ant that I saw pass in or out during the lapse of weeks passed between these two points. The burdened ant always appeared to have the right of way, and when meeting another without a burden there was no question of this right. In such a case the burden was usually held aloft, and the right of way conceded without debate. A little later in the season I had the opportunity of seeing the same colony emigrate to a point about eighty feet distant from their original abode, at which time they carried large burdens and were many days in completing their work, but the same system and methods prevailed.
As far as desire can be found in life the means of expression go hand in hand with it, but I do not contend that desire alone is the origin of this faculty. So far as human ears can ascertain, the lowest forms of life appeared to dwell in perpetual silence, but there may be voices yet unheard, more eloquent than we have ever dreamed of.
CHAPTER XXV.
Facts and Fancies of Speech—Language in the Vegetable Kingdom—Language in the Mineral Kingdom.
In the early part of this work I have recorded the material and tangible facts with which I have dealt, and have not departed from such facts to formulate a theory beyond a working hypothesis. I have not allowed myself to be transported into the realm of fancy, nor have I claimed for my work anything which lies beyond the bounds of proof. But in the wide range through which I have sought for the first hint of speech, it is only natural that many theories have suggested themselves to me from time to time, some of which would appear almost like the dreams of hasheesh. But while they are like the fairyland of speculation, they are not more wild and incoherent than are many of the dogmas of metaphysics. And at this point I shall digress from my text so far as to say that I have followed the motives of language through the higher planes of life and thence downward to the very sunrise to the vegetable kingdom, and on through the dim twilight across the mineral world to that point where elemental matter is first delivered from the hands of force. Standing upon the elevated plane of human development, it is difficult for man to stoop to the level of those inferior forms from which he is so far removed in all his faculties; but if his senses could be made so delicate as to discern the facts, he would find perhaps that in the polity of life all horizons are equidistant from each other. But looking back from where he stands, his powers fail to reach the real point of vital force at which all life began, and his contracted senses bring the vanishing point of this perspective far into the foreground of the facts.
From the highest type of human speech to the feeblest hint of expression there is a gradual descent, and at no point between these two extremes can there be drawn a line at which it may be said "here one begins, and here another ends." The same is true of other faculties; and from the vital centre at which matter first receives the touch of life to the circumference of the vital sphere, all powers radiate alike, and there is no point that I can find between that centre and infinity at which some new endowment intercepts the line.
Descending the scale of life by long strides, from man to the lowest form of zooids, we cannot designate the point at which a faculty is first imparted to the form which has it, and this truth extends throughout the vital cosmos.
LANGUAGE IN THE VEGETABLE KINGDOM
The line of demarcation which separates the animal and vegetable is but a wavering, blended mezzotint, and the highest forms of vegetable life seem to overlap the lowest forms of animal, so far that no dividing line is positively fixed. The highest types of vegetable seem to have the faculty of expression in a degree corresponding to, and in harmony with, the rest of their organism. I do not mean to say that the impulse under which a plant acts is synonymously with that which prompts the animal, but both appear to be the effect of the same cause.