The preservation of the tracks of numerous animals in some of the sandstones shows us how deep and permanent an impression the most trivial action of a living being may make. In these footmarks we sometimes notice a change in the direction of the animal along the surface; and, of course, an impression deeper or more shallow than usual, of parts of the foot, by the action of the muscles employed in changing the animal’s course. Here, then, we have the register of so slight an action as an increased or diminished action of a particular muscle of the leg. Nay, further, such a movement affords us an infallible register of an act of the animal’s will, since that must have preceded the change; and that implies an electric current, first inward along the sensor nerves, and then outward along the motor nerves.
Geology lays open before us a map of the changes in organic nature from the apparent commencement of life on the globe, and thus enables us to see examples of this kind of reaction. We find different economies of life to have appeared, but all of them most wisely adapted to existing circumstances. In each economy we perceive the balance between the different tribes provided for. If, for instance, one race of carnivorous species died out, new races were created to occupy their place, so that the herbivorous species should not overrun the globe. Thus, when the early sauroid fishes diminished, the gigantic and carnivorous marine saurian reptiles were introduced. And when the chambered shells, whose occupants were carnivorous, disappeared with the secondary period, numerous univalve mollusks were created to feed on other animals; although previously that family were herbivorous. It would seem, however, as if each successive economy of organic life had contained within itself the seeds of extinction. It was, indeed, mainly a change of climate which first caused some species to disappear. But their destruction so disturbed the balance of creation that others followed, until total extinction was the result, which, however, was often hastened by catastrophes.
Thus we have in the stony volume of the earth’s history actual examples of effects resulting from the acts, and even volitions, of the inferior animals, which can never be erased while the rocks endure.
If, therefore, with our imperfect senses, we can see these results so distinctly, we may safely infer that human conduct, and thought, and volition impress upon the globe, nay, upon the universe, marks which nothing can obliterate.
The thoughts which press upon the mind, in view of such a conclusion, are numerous and interesting. A few we can hardly help noticing.
In the first place, what a centre of influence does man occupy!
It is just as if the universe were a tremulous mass of jelly which every movement of his made to vibrate from the centre to the circumference. It is as if the universe were one vast picture gallery, in some part of which the entire history of this world, and of each individual, is shown on canvas, sketched by countless artists, with unerring skill. It is as if each man had his foot upon the point where ten thousand telegraphic wires meet from every part of the universe, and he were able, with each volition, to send abroad an influence along these wires, so as to reach every created being in heaven and in earth. It is as if we had the more than Gorgon power of transmuting every object around us into forms beautiful or hideous, and of sending that transmuting process forward through time and through eternity. It is as if we were linked to every created being by a golden chain, and every pulsation of our heart or movement of our mind modified the pulsation of every other heart and the movements of every other intellect. Wonderful, wonderful is the position man occupies, and the part he acts! And yet it is not a dream, but the deliberate conclusion of true science.
Secondly. We see in this subject the probability that our minutest actions, and perhaps our thoughts, from day to day, are known throughout the universe.
I speak not here of the divine omniscience, which we know reaches every thought and action; but I refer to created beings. Science shows us how, in a variety of modes, such knowledge may be conveyed to them by natural agencies; and we have only to suppose them to be possessed of far more acute sensibilities than man’s, in order to be affected by these agencies as we are by more powerful impressions. And when we consider how fettered and depressed a condition this world obviously is in, because of its sinfulness, who will doubt but the unfallen beings of other spheres may enjoy those keener perceptions that will bring our whole history distinctly before them, day by day? The thought is, indeed, startling, but not unphilosophical.
If this suggestion be true, then may we indulge the thought as highly probable that our friends, who have gone before us into the eternal world, may be as familiar with our conduct, our words, and even our thoughts, as we are ourselves. If we are acting as we ought, and so as will please them, this must be an animating idea; but if we are not, let it serve to stimulate us to our duty, if a sense of the divine omniscience is not sufficient.