Introduction. Of the movements occurring in the tissues of living beings, and of contractility.—The distribution of nerves to involuntary muscle. Distribution of nerves to the muscular fibres of the frog’s bladder. Distribution of nerves to the muscular fibres in the walls of arteries, veins, the intestine, ducts of glands, &c. —The distribution of nerves to striped muscle. Of the arrangement of the dark-bordered nerve-fibres distributed to voluntary muscle and other tissues.