We should note, however, that, in defining the thought of a relation by the sensation of that relation, or, in briefer terms, thought in general by sensation, Destutt is indeed covering, without emerging from it, the wholedomain of representation; but he reaches the frontier where sensation as the primary, completely simple form of representation, as the minimum content of what can be given to thought, topples over into thedomain of the physiological conditions that can provide an awareness of it.