Very questionable, moreover, does it seem, whether, with propriety, an individual soul can be attributed to animals. With those that are most closely domesticated with man, there does undoubtedly arise, as it were, by a sort of mental contagion, the appearance of individuality and difference of character, just as the artistic structures of certain species form a kind of analogy to human reason, and as the melodious intonations and feelings of some others seemed to me entitled, in a similar sense, to be termed reverberations of fancy. In all those kinds, however, which remain undisturbed in their natural state, the whole species possesses the same character, and have, consequently, the same common soul.[30] The species itself is only an individual; and, consequently, the several species must be considered as so many living forms of the general organic force of animated nature, since an immortality of individual souls can, in the case of animals, neither be assumed nor allowed to be assumable.
Among those perplexities, or, as I termed them, questioning feelings about nature and its animating principle, I turn now to the consideration of the last instance, that of the maggots of putrefaction. Is not this one of the clearest possible proofs that all nature is animated?[31] So much so, and so eminently is this the case, that even in death and corruption, in foulness and disease, it still livingly operates and produces life--the lowest grade, undoubtedly, of life--or, if any so prefers to call it, a false life--but still a life. Now, can such morbid productions of nature, the worms, _e.g._ [_entozoa_], which in certain diseases are engendered in the bowels, be regarded as real creatures? Naught are they but the dissolving and crumbling matter of life, which even in dissolution is still living.[32] And this fact is not confined merely to organic corruption and disease. Even the element--the fresh water from the spring--is full of life, and it is the more so the clearer and the better it is and the purer from the microscopic animalculæ, which swarm in it more and more the longer it stagnates and becomes foul, until at last, as frequently happens when it has been kept long on shipboard, with the growing foulness of the water they increase in size, and swim about as worms of visible magnitude. Many other instances might be adduced in proof of this origination of worms and vermin out of corruption, and testifying to it as a general principle of nature. And are not those swarms of locusts which in Asiatic countries are a general plague of the lands over which they sweep with their thick and dark migratory hordes, a sickly proof that the atmosphere that has engendered them is passing, or has already fallen into corruption beneath the influence of some other contagious element?