Any person who desires it, may, at his option, instead of taking an oath, make his solemn affirmation or declaration, by assenting when addressed, in the following form: "You do solemnly affirm (or declare), that," etc., as above provided.

[(9-1405) C.C.P. 1881, sec. 996; R.S., R.C., & C.L., sec. 6131; C.S., sec. 8068; I.C.A., sec. 16-1405.]