Note 19 — Chapter II · FIRST PERIOD OF HUMANISM
Reading edition
See the interesting letter to Luca di Penna, De Libris Ciceronis, p. 946, and compare De Ignorantiâ sui ipsius, &c. p. 1044. These references, as well as those which follow under the general sign Ibid., are made to the edition of Petrarch's collected works, Basle, 1581.