In the pathological area it seems more difficult to see the relevance of the teleological cause. (ii) Galen does seems to think that a sufficiently full account of the internal and external low-level conditions should be fully predictive of the disease outcome (this, then, will be a question of understanding in sufficient detail the preceding and antecedent causes). (iii) Certainly fevers are hot diseases and, moreover, their individual differences—as well as the treatment indicated—are to a considerable extent explicable in terms of the terminology of the fundamental qualities. Yet once they take hold, they function according to a complex rationale (Galen sometimes uses the term idea, “form” or “structure”, related to the Aristotelian term for form, eidos, in reference to such disease entities) and appear to have their own causal powers; the best interpretation of the Galenic picture may, however, well be that such powers would in theory (via some complex hypothetical account which Galen understandably does not feel the need to consider) be fully explicable in terms of the states and interactions of fundamental qualities.