See the Ceremoniale of Constantine Porphyrogenitus, l. ii. c. 44, p. 176 - 192. A critical reader will discern some inconsistencies in different parts of this account; but they are not more obscure or more stubborn than the establishment and effectives, the present and fit for duty, the rank and file and the private, of a modern return, which retain in proper hands the knowledge of these profitable mysteries.