If all the subscribing witnesses are dead, insane, blind, or deaf and dumb, the instrument may be proved before the county clerk or deputy county clerk by any two (2) persons who are acquainted with the handwriting of the maker of the same.
Code 1858, § 2054 (deriv. Acts 1831, ch. 90, § 10); Shan., § 3729; Code 1932, § 7644; impl. am. Acts 1978, ch. 934, §§ 22, 36; T.C.A. (orig. ed.), § 64-2314.