“…Colonic motility is generally reduced in patients with ulcerative colitis (Spriggs, Code, Bargen, Curtiss, and Hightower, 1951 ;Kern, Almy, Abbot, and Bogdonoff, 1951;Bloom, LoPresti, and Farrar, 1968;Jalan, Walker, Prescott, Butterworth, Smith, and Sircus, 1970), while notable features of the condition (Lennard-Jones, Lockhart-Mummery, and Morson, 1968), are the striking shortening of the colon with loss of the haustra which are normally maintained in part by an action of the circular muscle of the colon, which also becomes thickened. The smooth x-ray appearance of the colonic wall at barium enema examination has been explained on this basis, but no biochemical differences have hitherto been demonstrated between diseased and normal muscle which satisfactorily explain these changes.…”