A presentment is an informal statement in writing, by the grand jury, representing to the court that a public offense has been committed which is triable in the county, and that there is reasonable ground for believing that a particular individual named or deecribed therein has committed it. Pen. Code Cal. § 916. And see In re Grosbols, 109 Cal. 445, 42 Pac. 444; Com. v. Green, 126 Pa. 681, 17 Atl. 878, 12 Am. St. Rep. 804; Mack v. People, 82 N. Y¥. 237; Eason v.' State, 11