Medical Philosophers commonly assumed three Internal Senses or stages of the representative process: 1. Gathering the several sense-perceptions into one collective image in the fore part of the brain; 2. Transforming or remodelling this representation of the general Sense, with the help of representations already existing, thus constituting apperception proper, in the middle region; 3. Storing up the ‘apperceived’ representation in the Memory, which was held to reside in the hinder part of the brain. Ibn Sina, however, carries the analysis somewhat farther. He distinguishes in the anterior portion of the brain the Memory of the Sensible,—or the treasure-house of the collective images,—from the General or Co-ordinating Sense. Farther, he makes out Apperception,—the function of the middle region of the brain,—to be in part brought about unconsciously, under the influence of the sensible and appetent life, as is the case also with the lower animals, and, on the other hand, to take place in part consciously, with the co-operation of the Reason. In the first case the representation preserves its reference to the individual thing,—thus the sheep knows the hostility of the wolf,—but in the second case, the representation is extended to the Universal. Then, in the hinder part of the brain, the Representative Memory, or store-house of the representations formed by combined Sensuous Impression and Rational Reflection, follows as a fifth power. In this way five Internal Senses [18] correspond to the five External Senses, although with quite another reference than the five Internal Senses of the Faithful Brethren. The question which is raised—as to whether one should farther separate Recollection, as a special faculty, from Memory,—remains unanswered.