Of the civil jurisprudence of successions, testaments, codicils, legacies, and trusts, the principles are ascertained in the Institutes of Caius, (l. ii. tit. ii. - ix. p. 91 - 144,) Justinian, (l. ii. tit. x. - xxv.,) and Theophilus, (p. 328 - 514;) and the immense detail occupies twelve books (xxviii. - xxxix.) of the Pandects.