In the account of the different physical composition of different animals and human beings in Temp., meanwhile, eidos is the term used to refer to different species—each of which has its own different internal organization and range of typical qualities. This has a particular importance for accurate physical description, especially of the kind relevant for the doctor: it is by reference to this eidos that we meaningfully apply adjectives such as hot or cold to a body. It is not relevant whether they are hot or cold in some abstract sense, in relation to the whole cosmos, nor whether they possess those properties by comparison with members of a different eidos. The assessment of those qualities must be carried out in relation to a theoretical midpoint specific to that creature’s eidos, which will have its own possible range of mixtures, as well as its own optimal mixture. Mixtures themselves can be classified according to their eidos; and this same classificatory terminology (we might here use a term like “types”) is used in the classification of such theoretical items as diseases, and varieties of pulse or massage, according to the appropriate distinctions or differentiae (diaphorai). And in QAM (see below, §7.2) it is stated, with Aristotelian authority (or perhaps rather: the view is attributed to the school of Aristotle), that form, in the context of a certain level of biological analysis, means the same as mixture; and that this level of biological analysis is that relevant to the soul itself.