A. Chapter I, 1-15: Chronologically arranged sayings of the oldest
authorities, from the men of the Great Synagogue to Hillel
and Shammai.

B. (1) Chapters I, 16-II, 4: Sayings of the men of the school of
Hillel to Rabban Gamaliel (about 230 C.E.), the son of Judah
ha-Nasi

(2) Chapter II, 5-8: Additional sayings of Hillel.

C. (1) Chapter II, 9-19: The sayings of Jochanan ben Zakkai, the
pupil of Hillel, and of his disciples.

(2) Chapter II, 20-21: The sayings of Rabbi Tarfon, a younger
contemporary of Jochanan ben Zakkai.

D. Chapter III: the maxims of seventeen _Tannaim_ (authorities
mentioned in the _Mishnah_) to the time of and including
Rabbi Akiba. These are not arranged in strictly
chronological order.

E. Chapter IV: The sayings of twenty-five _Tannaim_ after the time
of Rabbi Akiba, who were contemporaries of Rabbi Meir and of
Rabbi Judah Ha-Nasi. These are not chronologically arranged.

F. (1) Chapter V, 1-18: Anonymous sayings forming a series of groups
of ten, seven, and four things, dealing with the creation of
the world, with miracles, and with the varieties of men and
minds.