A mere possibility not coupled with an interest cannot be transferred.
§ 70-1-504, MCA
En. Sec. 1441, Civ. C. 1895; re-en. Sec. 4591, Rev. C. 1907; re-en. Sec. 6838, R.C.M. 1921; Cal. Civ. C. Sec. 1045; Field Civ. C. Sec. 461; re-en. Sec. 6838, R.C.M. 1935; R.C.M. 1947, 67-1504.