And yet it is effective as a single, unified system – which manifestly it is – precisely because of differentiation within. It is a resonant, not simply uniform, whole. If every nerve really always excited all the others, we could not function at all, any more than if no nerve excited any other. Each nerve communicates, potentially, with all others – yes; but either by facilitating and promoting, or by inhibiting and delaying. It is not that in one case there isn’t, and in the other there is, communication. Each is a form of communication.
