This section is from the book "The Law Of Contracts", by William Herbert Page. Also available from Amazon: Commercial Contracts: A Practical Guide to Deals, Contracts, Agreements and Promises.
Sec. 2830. Nature of appropriation of payments.
Sec. 2831. Appropriation by mutual consent.
Sec. 2833. When debtor can make appropriation.
Sec. 2837. When creditor can make appropriation
Sec. 2838. Appropriation by law - Presumed mutual intention of parties followed. Sec. 2839. Appropriation in order of maturity of debt. Sec. 2840. Appropriation as between principal and interest. Sec. 2841. Conflict between interests of debtor and creditor - Common-law rule. Sec. 2842. Civil-law rule.
Sec. 2843. Interest of third persons in fund used for payment. Sec. 2844 Source of payment as affecting appropriation. Sec. 2845. Creditor's ignorance or knowledge of interest of third person or source of fund. Sec. 2846. Appropriation, when immaterial. Sec. 2847. Involuntary payments. Sec. 2848. What amounts to appropriation by debtor. Sec. 2849. What amounts to appropriation by creditor. Sec. 2850. What amounts to appropriation by act of the law. Sec. 2851. Effect of appropriation.