The author then reverts to his main theme, and devotes several strenuous sentences to emphasizing the necessity for instruction in youth, "since gems unwrought can never be useful, and untaught persons will never know the proprieties." After a further citation of wonderful examples in Chinese history, accompanied with due moralizing, there follow more than sixty lines of a characteristically Chinese mosaic. The little pupil is enlightened on the progressive nature of numbers; the designations of the heavenly bodies; the "three relations" between prince and minister, father and son, man and wife; the four seasons; the four directions; the five elements; the five cardinal virtues; the six kinds of grain; the six domestic animals; the seven passions; the eight kinds of music; the nine degrees of relationship and the ten moral duties. Having swallowed this formidable list of categories, the scholar is treated to a general summary of the classical books which he is to study as he advances. When he has mastered all the works adjudged "Classic," he is told that he must go on to those of philosophers and sages, as in the bill of particulars contained in the Trimetrical Classic. His special attention is invited to history, which suggests a catalogue of the numerous Chinese dynastic periods with the names, or rather the styles, of a few of the important founders of dynasties. The list is brought down to the first emperor of the present dynasty, where it abruptly stops at the year 1644. A pupil who wishes to know the titles of the later emperors of the Ch'ing Dynasty can be accommodated when the same shall have been overthrown, and therefore has become a suitable object of historical study. The pupil is urged to ponder these records of history till he understands things ancient and modern as if they were before his eyes, and to make them his morning study and his evening task.