- Section 68. Claim for necessaries supplied to person incapable of contracting, or on his account
- Section 69. Reimbursement of person paying money due by another, in payment of which he is interested
- Section 70. Obligation of person enjoying benefit of non-gratuitous act
- Section 71. Responsibility of finder of goods
- Section 72. Liability of person to whom money is paid, or thing delivered, by mistake or under coercion-