Where by a breach of contract a party is injured, he is bound to lessen the damages as far as is practicable by the use of ordinary care and diligence. (Civil Code 1895, § 3802; Civil Code 1910, § 4398; Code 1933, § 20-1410.) 396 History of Code section. — This Code section is derived from the decisions in Western Union Tel. Co. v. Reid, 83 Ga. 401, 10 S.E. 919 (1888), and Georgia R.R. & Banking Co. v. Eskew, 86 Ga. 641, 12 S.E. 1061 (1891). 13-6-5