COMMON SENSE nowadays usually signifies the intelli gence of normal people as distinguished from the views more or less peculiar to those who belong to special schools of thought. The contrast intended is sometimes that between the views of average people as against the views of peculiar or exceptional people, and sometimes that between the attitude of those who have just a general education and the attitude or outlook of those who have specialized in some way or other. The term, or rather its Greek equivalent (aoavrl afcrOrioes) was first introduced by Aristotle, who seems to have been prompted by a variety of considerations. The five senses of popular psychology are each of them a special sense —visual only, or auditory only, or tactual only, and so on. As the organs for each of them are distinct and separate it seems remark able that the visible, auditory, tactual and other sense qualities of an object should be localized in one and the same object. Hence the postulation of a "common" sense in addition to the "special" senses in order to account for the synthesis in question. Again, there are some things apprehended in sense perception which are not peculiar to any one of the special senses but are common to two or more of them—such are, for instance, motion, rest, num ber, size, shape. It seemed, therefore, reasonable to Aristotle to assume a common : ense for the apprehension of such "common sensibles" as they were called. Once more, the different special sense-impressions are frequently compared and commonly differ entiated. This likewise seemed to be the function of a common sense capable of comparing the reports of the several special senses. It is not quite certain whether Aristotle regarded the spe cial senses as special functions of the common sense which in cluded them all and more, or whether he regarded common sense as something separate from each of them but co-operating with them. In any case, he was led by the aforementioned and other considerations to formulate the existence of a common sense which he also credited with the function of memory, imagination and even of awareness of the fact that we are having sense-expe riences. It is this last function, probably, that prompted some later writers to substitute an "inner" sense for Aristotle's "com mon" sense. Having regard to the kind of functions which Aris totle attributed to "common sense" it is not strange that the term should eventually have come to acquire the meaning of some thing like the general intelligence of the ordinary person.