Novation is made by contract and is subject to all the rules concerning contracts in general.
§ 28-1-1503, MCA
En. Sec. 2072, Civ. C. 1895; re-en. Sec. 4960, Rev. C. 1907; re-en. Sec. 7462, R.C.M. 1921; Cal. Civ. C. Sec. 1532; Field Civ. C. Sec. 738; re-en. Sec. 7462, R.C.M. 1935; R.C.M. 1947, 58-507.