By an operation that makes visible to itself the totality of the field of experience at each of its stages, and dissipates all its opaque structures: an operation that totalizes by comparing organisms: tumour, redness, heat, pain, throbbing, tension as a sign of phlegmon, because one hand is compared with another, one individual with another;'' an operation that recalls normal functioning: cold breath in one subject is a sign of the disappearance of animal heat and, therefore, of a `radical weakening of the vital forces and of their imminent destruction'; an operation that registers the frequency of simultaneity or succession: `What relation is there between a coated tongue, a trembling of the lower lip, and a tendency to vomit?