It is contended that animals furnish us with a convincing evidence that there is some powerful cause of their existence; the admirable adaptation of their different parts, mutually receiving and conferring aid towards accomplishing their functions, and maintaining in health and vigor the entire being, announce to us an artificer uniting power to wisdom. Of the power of nature, it is impossible for us to doubt; she produces all the animals that we see by the help of combinations of that matter, which is in incessant action; the adaptation of the parts of these animals is the result of the necessary laws of their nature, and of their combination. When the adaptation ceases, the animal is necessarily destroyed. What then becomes of the wisdom, the intelligence, or the goodness of that alleged cause, to which was ascribed all the honor of this boasted adaptation? Those animals of so wonderful a structure as to be pronounced the works of an immutable God, do not they undergo incessant changes; and do not they end in decay and destruction? Where is the wisdom, the goodness, the fore-sight, the immutability of an artificer, whose sole object appears to be to derange and destroy the springs of those machines which are proclaimed to be masterpieces of his power and skill? If this God cannot act otherwise than thus, he is neither free nor omnipotent. If his will changes, he is not immutable. If he permits machines, which he has endowed with sensibility, to experience pain, he is deficient in goodness. If he has been unable to render his productions solid and durable, he is deficient in skill. Perceiving as we do the decay and ruin not only of all animals, but of all the other works of deity, we cannot but inevitably conclude, either that everything performed in the course of nature is absolutely necessary--the unavoidable result of its imperative and insuperable laws, or that the artificer who impels her various operations is destitute of plan, of power, of constancy, of skill, and of goodness.