in philosophical history, an appellation given by Epicurus to his doctrine of logic. It was called

---

Stair's Institutions of the Law of Scotland, b. i. tit. i. § 14. Winton's Cronykil of Scotland, vol. ii. p. 386. Guil. Grotti Vitae Jurisconsultorum, p. 150. Lindsay's Works, vol. iii. p. 49. Bachii Hist. Jurisprudentiae Romanae, p. 477. Canonicall Letters, in the ancient church, were a sort of testimonials of the orthodox faith, which the bishops and clergy sent each other, to keep up the Catholic communion, and distinguish orthodox Christians from Arians and other heretics. They were denominated canonical, either as being composed according to a certain rule or form, or because they were given to the canonist, that is, those comprehended in the canon or catalogue of their church. When they had occasion to travel into other dioceses or countries, dismissionary and recommendatory letters, also letters of peace, and the like, were so many species of canonical letters.