 The first chapter reviews the common teaching since 1250. Having noted that before 1250, all philosophers and theologians held that the vegetative and sensitive souls came to be by way of natural generation and that the intellectual soul came from the outside, Bacon says, “And still to this day (c. 1269–70) the English theologians and all true lovers of wisdom (philosophantes) uphold this position” ([OHI, IV], 282), that is, that the intellectual soul alone is created by God while the vegetative and sensitive souls in the human are produced from the potency of matter in accordance with the laws of nature. He argues that those opposed to this position rely on the Pseudo-Augustine, De spiritu et anima, and on the De ecclesiasticis dogmatibus by Gennadius. Those who follow these sources, he states, hold that “the vegetative and sensitive souls are co-created with the intellectual soul…” He describes this as a kind of ‘folk-psychology’. For Bacon and “all philosophers,” embryology shows that the embryo is nourished and grows prior to the infusion of the intellectual soul. Bacon states the problem as follows: