45-111.Usury; civil proceedings; testimony of lender compellable.Any person charged with taking illegal interest may be required to answer touching the same, on oath, in any civil proceeding.SourceLaws 1879, § 6, p. 114; R.S.1913, § 3351; C.S.1922, § 2839; C.S.1929, § 45-106; R.S.1943, § 45-111.