The criminal offense of wlll-fully and knowingly contracting a second marriage (or going through the form of a second marriage) while the first marriage, to the knowledge of the offender, is still sub-sistlng aud undissolved. Com. v. McNerny, 10 Phila. (Pa.) 207; Gise v. Com., 81 Pa. 430; Scoggins v. State, 32 Ark. 213; Cannon v. U. S., 116 U. S. 55, 6 Sup. Ct 287, 29 L. Ed. 561