himself with instructing his visitors orally.

During the above-mentioned six years, as several questions had been cleared up in the lectures of Plotinos, and at the urgent request of Amelius and myself that he write them down, he wrote two books to prove that

PLOTINOS'S BOOKS OF THE SECOND PERIOD
(THE PORPHYRIAN PERIOD).

Then he wrote the book entitled:

He also wrote the following books:

Plotinos wrote these twenty-four books during the six years I spent with him; as subjects he would take the problems that happened to come up, and which we have indicated by the titles of these books. These twenty-four books, joined to the twenty-one Plotinos had written before I came to him, make forty-five.

VI. PLOTINOS'S BOOKS OF THE THIRD PERIOD
(THE EUSTOCHIAN PERIOD).

While I was in Sicily, where I went in the fifteenth year of the reign of Gallienus, he wrote five new books that he sent me:

These books he sent me in the last year of the reign of Claudius II, and at the beginning of the second.

Shortly before dying, he sent me the following four books:

These nine books, with the forty-five previously written, make in all fifty-four.

Some were composed during the youth of the author, others when in his bloom, and finally the last, when his body was already seriously weakened; and they betray his condition while writing