The word signature includes the mark of a person unable to write his name; a mark shall have the same effect as a signature when the name is written by some other person and the mark is made near thereto by the person unable to write his name.
Neb. Rev. Stat. § 29-108
R.S.1913, § 8908;
C.S.1922, § 9929;
C.S.1929, § 29-108;
R.S.1943, § 29-108.