text:  It is the duty of the advocate on such an occasion to put forth all his powers in behalf of his client; to obtain acquittal is his object: he must sift the hostile evidence he must apply every possible test to the accuracy of the testimony and to the credibility of the witnesses; he may address himself to the reason to the prejudices to the sympathies nay even to the worst passions of the twelve men whose opinions he seeks to influence in favour of his client