The grand jury ought to find an indictment when all the evidence before them, taken together, if unexplained or uncontradicted, would, in their judgment, warrant a conviction by a trial jury.

[(19-1107) Cr. Prac. 1864, sec. 208, p. 238; R.S., R.C., & C.L., sec. 7636; C.S., sec. 8795; I.C.A., sec. 19-1007.]