In courts of law as well as in those of equity, the interest of a bona-fide assignee of a chose in action will be protected against any unauthorized act on the part of the assignor tending to interfere with the rights of the assignee. Kitcart v. Kitcart, 145 Ia. 549, 124 N.W. 305, 30 L.R.A. (N.S.); Weakly v. Hall, 13 Ohio, 167, 42 Am. Dec. 194; Gallagher v. Caldwell, 22 Pa. St. 300, 60 Am. Dec. 85, 2 R.C.L. 63; Heisen v. Smith, 138 Cal. 216, 71 P. 180, 94 A.S.R. 39, 4 Cyc. 84; Field v. New York, 6 N.Y. 179, 57 Am. Dec. 435; Ann. Cas. 1912A, 675; Georgia Railroad Co., Ann. Cas. 1912A, page 675. As a general rule the interest under an ordinary option to purchase, that is, the right to elect to take a conveyance, is recognized as an assignable interest, and a fortiori this is true where the option runs to the person named "and his assigns."