WE have seen that of the three elements which compose the human aggregate, one only, the soul, resists destruction. After the dissolution of the body, after the extinction of the life, the soul, detached from the material bonds which chained it to the earth, goes away, to feel, to love, to conceive, to be free, in a new body, endowed with more powerful faculties than those allotted to humanity. It goes away to compose that which we call the superhuman being. But where does this new creature dwell?
All students of nature know that life is spread over our globe in prodigious proportions. We cannot take a step, our eyes cannot glance around us, without everywhere encountering myriads of living beings. The earth is nothing but a vast reservoir of life. Examine a blade of grass in a field, and you will find it covered with insects, or inferior animals. But your eyes will not suffice for this examination; you must have recourse to the microscope. With the aid of the magnifying glass, you will discover that this blade of grass is the refuge of an active population, which are born, multiply, and die with prodigious rapidity on their almost imperceptible domain.
From this blade of grass you may draw inferences and conclusions respecting the vegetation of the entire globe.
The fresh waters which flow upon the surface of the earth are also the receptacle of a prodigious quantity of organic existence. Without mentioning the plants, and the animals which live in the waters of the rivers and streams, and are visible to the naked eye, if you take a drop of water from a pool, and place it under the microscope, you will see that it is filled with living beings, who, though so small that they escape our unassisted vision, are none the less active, and all hold their appointed place in the economy of nature. We know how thickly peopled with inhabitants is the great drop; but, without speaking of beings visible to all, the fishes, the crustacea, and the zoophytes, or of the marine plants, creatures, invisible except under microscopical examination, abound to such an extent in sea water, that one single drop of it, so examined, displays innumerable quantities of these microscopic animals and plants.
From this drop of water you may draw inferences and conclusions respecting the entire mass of waters which occupy the basins of the seas, and form three-fourths of the surface of our globe.
In order that some conception may be reached of the enormous numbers of the living beings contained in the seas now, and formerly, we may fitly recall in this place a fact well known to geologists. It is, that all building stone, all the calcareous earth of which chalk hills and banks are formed, are entirely composed of the pulverized and agglomerated remains of the shells of mollusca, visible or microscopic, which, in the most remote ages of the existence of the globe, peopled the basin of the seas. The whole of this formation is composed of the accumulation of shells. If life has been lavished with such profusion in the waters during the geological periods, it must be equally lavished now, in almost similar ways, because the actual conditions of nature do not differ from what they were in the primitive ages of the globe.
The air which surrounds us is, like the earth and the seas, a vast receptacle of living creatures. We see only a few animals cleaving the aërial space, but the savant, who looks beyond the simple appearance of things, discovers myriads of existences in the air.
The air seems to us very pure, very transparent, but only because it is not sufficiently illumined by light to enable us to perceive the particles, or foreign bodies, which are floating about in it. When we allow one ray of daylight to penetrate into a closed room, one thread of solar light, we can discern a luminous streak flung across the chamber, while the remaining portion is still in darkness. We all know that, thanks to the powerful light, and its contrast with the surrounding obscurity, the luminous streak is seen to be filled with light, slender floating bodies, rising, descending, fluttering with the motion of the air. That which is perceptible in the atmosphere of a brightly-lighted room is necessarily existent in the entire atmosphere surrounding our globe, so that the air is everywhere filled with these specks of dust.
Of what are these specks of dust formed? Almost entirely of living creatures, of the germs of microscopic plants (cryptogamia), or of the eggs of inferior animals (zoophytes). So-called spontaneous generation, so largely discussed of late in France and other countries, is merely due to these organic germs which fill the atmosphere, and which, falling into the water, or into the infusions of plants, give birth to forms of vegetation, which have been imputed to spontaneous generation; that is to say, to a creation without a germ, a generation without a cause, which is an error. Every living thing has parents, which are always discoverable by science and attention.