Wonderful has been the development of the public school system in the present generation. Great teachers have appeared in all ages and schools have gathered about them. But this age is remarkable in this, that it has adopted a system of instruction for youth and has trained teachers for that system. The combination of these two elements makes the modern common school system. Let the adults of to-day state the case of their day. Such a comparison would show the value of the present. The great boon from the State to the youth of to-day is an educational system based on scientific principles. In that system two essentials must be emphasized: first, departments; and, second, the place of the pupil. These departments form a series that are mutually related and dependent. They each mark a step in the development of the mind of the pupil. Again, the pupil has his proper place in that system, assigned not by caprice but by a principle. That principle is the attainment of the pupil in the studies of the system. A competent instructor could find by examination the true place of any pupil in any city public school. Such a statement is so self-evident that it excites no surprise. It is as it should be. The method of assignment and promotion is the public school system. Without it that system would not be what it is. Apply now these essentials as tests to the Sunday schools. How are pupils there assigned and promoted? The answer must be that such assignment and promotions are there unknown. Here we touch a radical defect and weakness. The statement of that weakness hardly needs elaboration. As we study further the public school system we find there a course of study. That course of study, comprehensive and complete, the work of educators, is the glory of the system. It is this curriculum that makes its pupils students. In these points also compare the Sunday school. A summary of these conclusions may be made. The modern Sunday school is not the peer of the modern public school. The Sunday school has a defective system of unrelated, independent departments. The modern public school has a perfect system of correlated dependent departments. The Sunday school has no system of promotions, no training school for teachers, and no course of study. Do its pupils study? Why, they are not required, nor examined. Is there a remedy for such defects? Could its department be perfected? Yes; but the disease is deeper than that. Could a system of promotions be devised? Undoubtedly. Could a teachers' class be formed? Many schools have that. To treat these symptoms separately is not to reach the source of the disease. It is but to tamper with difficulties.