17. In the presence of the clerk of the Crown or his deputy, the sheriff shall place in a box and mix three hundred cards of the same size, numbered consecutively from one to three hundred.
He shall then draw one of such cards from the box, note the number thereof and set it aside from the box;
He shall, for each polling subdivision of each of the electoral lists constituting the jury list, select the name of the person whose number corresponds to that drawn from the box and inscribe each name on a card.