The street, foreign-born and negro boys will furnish very much the same kind of problem; because of a general rule, they may be all grouped under the wage-earning class. Some may be more shiftless than others and may need more attention, while others may be merely awaiting the touch of sympathy and the helping hand to make strong men out of them. A goodly percentage of our greatest Americans have been foreign-born boys, and, if there is any class that the Teacher should be more patient with than others, it is the immigrant and the son of the immigrant. =Grouping Standards= The Teacher will find it greatly to his advantage to group his boys according to some standard. Unfortunately, all standards, so far, are more or less artificial, but approximate success may be secured by using the experience of boy workers in various parts of the country. The standard which is most generally used is that of age. It is also the most unsatisfactory. Boys mature physically rather than chronologically. This makes the age standard a poor guess, because a boy may be physically fourteen when he is chronologically eleven, and vice versa. If the age standard be used, it would be preferable to group all the boys of twelve years together, then the thirteen-year-old boys in another group, and the same with the fourteen, the fifteen, the sixteen, and the seventeen-year-old boys. This would be rather hard to do in small places, although perfectly feasible in a larger town or city. Because of its impossibility, as far as the rural districts are concerned, it might be well to divide the years from twelve to eighteen into three standards--twelve to fourteen, fourteen to sixteen, and sixteen to eighteen. The age grouping, however, will never be reliable in achieving results, as the individual physical development varies so much. The height and weight standard is more scientifically correct than the age standard, although it has not been tested out enough to warrant any authoritative declaration in its favor. If this method is used for grouping, the standards for athletic competition among the boys might be used; that is, all the boys of ninety pounds and under might be put together, the same being true for those under one hundred and ten, one hundred and twenty-five, and one hundred and forty pounds. If height is used, boys of fifty-six and a half inches in height and classifying under ninety pounds in weight might be grouped together. Also boys of sixty-three inches in height and coming within the one hundred and ten pound weight. This standard will doubtless become the real basis of all groupings in the future, but as yet it needs more demonstration in order that the various classifications may be made accurately.