An agreement to sell realty "cash on delivery of deed, or one-half on time if terms can be agreed on," is a mere option and not a contract of sale. Wallace v. Figone, 107 Mo. App. 362, 81 S. W. 492; Ind & Ark. L. & M. Co. v. Pharr, 82 Ark. 573, 102 S. W. 686. See also Sec. 85.