Again, we may think in terms of emergent properties: how these natural capacities come about is not something that Galen is able to explain in detail, but they are properties of higher-level bodies which are not present in the elements, and must somehow arise in the former through the process of composition from the latter. (These latter also have capacities, but fundamental ones: fire has the capacity of heating, water of moistening, etc.) It is noteworthy that in a passage already cited (Prop. Plac. 9, 84–7) the “internal management” (dioikein) of the parts according to the natural capacities is closely related to this notion of activities or functions belonging to a part of the body “in virtue of its whole substance”.