The consent of the parties being essential to a contract, until each has assented to all the terms, there is no binding contract; until assented to, each party may withdraw his bid or proposition. (Orig. Code 1863, § 2689; Code 1868, § 2685; Code 1873, § 2727; Code 1882, § 2727; Civil Code
1895, § 3645; Civil Code 1910, § 4230; Code 1933, § 20-108.)