Kitap 7
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Some of them are also generated spontaneously and by chance in much the same way as things which are naturally generated; for sometimes even in the sphere of nature the same things are generated both from seed and without it.e.g. fish (Aristot. Hist. An. 569a 11) and insects (Aristot. Hist. An. 539a 24). We shall consider cases of this kind later.In Aristot. Met. 7.9. Things are generated artificially whose form is contained in the soul (by form I mean the essence of each thing, and its primary substance);
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for even contraries have in a sense the same form.The logical connection is: It is sufficient to say that the form of objects which are artificially produced is contained in the soul; for although artificial production can produce contrary effects, the form of the positive effect is the absence of the form of the negative effect, so that in a sense they have the same form. For the substance of the privation is the opposite substance; e.g., health is the substance of disease; for disease is the absence of health, and health is the formula and knowledge in the soul. Now the healthy subject is produced as the result of this reasoning: since health is so-and-so, if the subject is to be healthy, it must have such-and-such a quality, e.g. homogeneity; and if so, it must have heat.
