This declaration of M. Bayle pledged me to an answer. I therefore purposed to point out to him, that unless it be said that God forms organic bodies himself by a perpetual miracle, or that he has entrusted this care to intelligences whose power and knowledge are almost divine, we must hold the opinion that God _preformed_ things in such sort that new organisms are only a mechanical consequence of a preceding organic constitution. Even so do butterflies come out of silkworms, an instance where M. Swammerdam has shown that there is nothing but development. And I would have added that nothing is better qualified than the preformation of plants and of animals to confirm my System of Pre-established Harmony between the soul and the body. For in this the body is prompted by its original constitution to carry out with the help of external things all that it does in accordance with the will of the soul. So the seeds by their original constitution [66] carry out naturally the intentions of God, by an artifice greater still than that which causes our body to perform everything in conformity with our will. And since M. Bayle himself deems with reason that there is more artifice in the organism of animals than in the most beautiful poem in the world or in the most admirable invention whereof the human mind is capable, it follows that my system of the connexion between the body and the soul is as intelligible as the general opinion on the formation of animals. For this opinion (which appears to me true) states in effect that the wisdom of God has so made Nature that it is competent in virtue of its laws to form animals; I explain this opinion and throw more light upon the possibility of it through the system of preformation. Whereafter there will be no cause for surprise that God has so made the body that by virtue of its own laws it can carry out the intentions of the reasoning soul: for all that the reasoning soul can demand of the body is less difficult than the organization which God has demanded of the seeds. M. Bayle says (_Reply to the Questions of a Provincial_, ch. 182, p. 1294) that it is only very recently there have been people who have understood that the formation of living bodies cannot be a natural process. This he could say also (in accordance with his principles) of the communication between the soul and the body, since God effects this whole communication in the system of occasional causes to which this author subscribes. But I admit the supernatural here only in the beginning of things, in respect of the first formation of animals or in respect of the original constitution of pre-established harmony between the soul and the body. Once that has come to pass, I hold that the formation of animals and the relation between the soul and the body are something as natural now as the other most ordinary operations of Nature. A close parallel is afforded by people's ordinary thinking about the instinct and the marvellous behaviour of brutes. One