Authorities. 1 , Dr. T. J. Gallaher, a boy, aged nine years, in whom vomiting and purging were easily induced by indigestible food, took at least 1/2 oz. of the oil on a nearly empty stomach, but ate supper soon afterward, Med. Examiner, 8, 347; 2 , Dr. W. E. Townsend; a women drank 6 oz. of the essence of checkerberry, Boston Med. and Surg. Journ. (from Records of Boston Soc. for Med. Improvement); 3 , Dr. Hooker; a young woman drank toddy containing a large amount of checkerberry, ibid.