It has been shown by my late experiments, that we may cut away, either in front, or behind, or above, or on one side, a very considerable slice of the hemisphere of the brain, without destroying the intelligence. Hence it appears, that quite a restricted portion of the hemispheres may suffice for the purposes of intellection in an animal.[22] On the other hand, in proportion as these reductions by slicing away the hemispheres are continued, the intelligence becomes enfeebled, and grows gradually less; and certain limits being passed, is wholly extinguished. Hence it appears, that the cerebral hemispheres concur, by their whole mass, in the full and entire exercise of the intelligence.[23] In fine, as soon as one sensation is lost, all sensation is lost; when one faculty disappears, all the faculties disappear. There are not, therefore, different seats for the different faculties, nor for the different sensations. The faculty of feeling, of judging, of willing any thing, resides in the same place as the faculty of feeling, judging, or willing any other thing, and consequently this faculty, essentially a unit, resides essentially in a single organ.[24] The understanding is, therefore, a unit. According to Gall, there are as many particular kinds of intellect as there are distinct faculties of the mind. According to him, each faculty has its perception, its memory, its judgment, will, &c., that is to say, all the attributes of the understanding, properly so called.[25] “All the intellectual faculties,” says he, “are endowed with the perceptive faculty, with attention, recollection, memory, judgment, and imagination.”[26] Thus each faculty perceives, remembers, judges, imagines, compares, creates; but these are trifles—for each faculty _reasons_. “Whenever,” says Gall, “a faculty compares and judges of the relations of analogous or different ideas, there is an act of comparison, there is an act of judgment: a sequence of comparisons and judgments constitutes reasoning,” &c.[27] Therefore, each and every faculty is an understanding by itself, and Gall says so expressly. “There are,” says he, “as many different kinds of intellect or understanding as there are distinct faculties.”[28] “Each distinct faculty,” says he, further, “is intellect or understanding—each _individual intelligence_ (the words are precise) has its proper organ.”[29] But, admitting all these _kinds of intellects_, all these _individual understandings_, where are we to seek for the General Intelligence, the understanding, properly so called? It must, as you may please, be either an _attribute_ of each faculty,[30] or the _collective expression_ of all the faculties, or even the mere simple _result_ of their common and simultaneous action;[31] in one word, it cannot be that positive and single faculty which we understand, conceive of, and feel in ourselves, when we pronounce the word _soul_ or _understanding_.