We may further designate this type of individual by saying that he has the mentality of a normal child of from three to twelve years of age. These age limits have been determined by examining thousands of the inmates of institutions for the feeble-minded and comparing with normal children. The inmates of the institutions are there because they were not capable of managing their own affairs with ordinary prudence, because society has discovered that they could not take care of themselves; they are weak-minded; they must be cared for by the public. Careful examination of such persons as have been determined by experience to be incapable of managing themselves shows that they range in intelligence, as before stated, from three to twelve years. There are practically none in these institutions that have a mentality above twelve. Those under three are called idiots. Considered from the standpoint of the growth and the development of the child, we say that the imbecile is a case of arrested development; he has stopped growing mentally, and has stopped previous to the age of twelve, so that no matter what may be his actual age his mentality is that of a child under twelve years. In the case of Jean Gianini, although he is sixteen years old, he has only the mentality of a child of ten. Or, if a possible error of two years were allowed, he would still have only the mentality of twelve and would be an imbecile. As a matter of fact, there is probably nothing in the whole career and history of Jean Gianini that is inconsistent with a mentality under twelve; and on the other hand there are numbers of things in evidence in connection with his crime that are so thoroughly typical of high-grade imbeciles that any one with experience with this type of person can have no doubt about it; but it is our purpose to show this by an analysis of the case. We must first attempt to remove some of the difficulties in the way of this view. First, why does it seem absurd to call Jean Gianini an imbecile? Mainly because in the popular mind the term imbecile connotes only the low-grade imbecile, the person who shows in every movement and action, if not in his very face, that he is "lacking," is "not all there," is "not quite right," or whatever may be the expression that we apply to those unfortunate ones, of whom there are, sad to say, always one or more in every community.