Chapter Xi. Oaths and Vows.

Chapter XII. belongs rather to Political Economy. Its subject is the values of goods in commerce, and the nature of coin.

Chapter XIII. enumerates the various classes of contracts, following the Roman Law, taking up Mandatum, Depositum, Letting to Hire, Sale, &c.

Chapter XIV. adds the Roman quasi-contracts.

Chapter XV. Rights arising from injuries or wrongs (torts). He condemns duelling, but admits that, where it is established, a man may, in some cases, be justified in sending or accepting a challenge.