[CHAP. X. Of the Several Appearances of the Exterior Parts of One Creature.]
Every altered Action of the Exterior Parts, causes an altered Appearance: As for example, A Man, or the like Creature, doth not appear when he is old, as when he was young; nor when he is sick, as when he is well in health; no, nor when he is cold, as when he is hot. Nor do they appear in several Passions alike: for, though Man can best perceive the Alteration of his own Kind, or Sort; yet, other Creatures have several Appearances, as well as Man; some of which, Man may perceive, though not all, being of a different sort. And not only Animals, but Vegetables, and Elements, have altered Appearances, and many that are subject to Man's perception.
[The Fourth Part.]
[CHAP. I. Of Animal Productions; and of the Differences between Productions, and Transformations.]
I understand Productions to be between Particulars; as, some particular Creatures to produce other particular Creatures; but not to transform from one sort of Creature, into another sort of Creature, as Cheese into Maggots, and Fruit into Worms, &c. which, in some manner, is like Metamorphosing. So by Transformation, the Intellectual Nature, as well as the Exterior Form, is transform'd: Whereas Production transforms only the Exterior Form, but not the Intellectual Nature; which is the cause that such Transformations cannot return into their former state; as a Worm to be a Fruit, or a Maggot a Cheese again, as formerly. Hence I perceive, that all sorts of Fowls are partly Produced, and partly Transformed: for, though an Egg be produced, yet a Chicken is but a Transformed Egg.