These salutary institutions are explained in the Theodosian Code, l. xiii. tit. iii. De Professoribus et Medicis; and l. xiv. tit. ix. De Studiis liberalibus Urbis Romae. Besides our usual guide (Godefroy), we may consult Giannone (Istoria di Napoli, tom. i. p. 105-l l l), who has treated the interesting subject with the zeal and curiosity of a man of letters who studies his domestic history.