" Again, "delivery" has been described as a composite act; an act in which both parties must join and the minds of both parties must concur. [18 C.J. 478; Kinne v. Ford, 52 Barb. (N.Y.) 194, 197.] Dr. Bishop, in his standard Commentaries on the Law of Contracts (2 Ed.), section 349, page 139, says: "Not only a specialty, but . . . every other written contract, must, to take effect, be delivered; and the delivery must be absolute, . . .