=Solipeds.= The _horse_ leaves off feeding or whatever he may have been engaged in, paws with his fore feet, moves uneasily with his hind ones or kicks with them, one at a time against the abdomen or out backward, he looks back at the abdomen with pinched, drawn, anxious countenance, bright anxious eye, and dilated nostrils, he moves uneasily from side to side of the stall or box, crouches for a few seconds with semi-bent knees and hocks and then throws himself down violently with a prolonged groan. When down he may roll from side to side over the back, and struggle in various ways, he may start to rise, sit for a moment on his haunches, then go down and roll as before. Or he may get up, shake himself and resume feeding as if entirely well. Soon the spasms reappear, suddenly as at first, and after a time subside as before. Thus the disease proceeds, each succeeding paroxysm diminishing in violence until they permanently subside, or increasing until the animal dies worn out with shock, suffering and exhaustion. If the paroxysms are severe the skin is usually bathed more or less in perspiration. Usually the peristalsis continues more or less, a rumbling is heard in the bowels and more or less fæces are passed in small solid balls or semi-liquid. The _course_ of the disease is usually rapid and followed by recovery. When prolonged it may become complicated by volvulus, invagination, indigestion or even enteritis. _Diagnosis._ The characteristic symptoms are the suddenness of the onset, the extreme suffering during the paroxysm, the reckless manner in which the animal throws himself down, the intermissions with complete absence of pain, the natural condition of the pulse and temperature in the intermissions, the comfort with which the patient shakes himself, and the absence of all abdominal tenderness, manipulation and friction seeming to give relief rather than discomfort. In the colic of =acute indigestion= there is the previous excessive or unwholesome meal, or the full drink after feeding; there is tympany, or a loaded state of the abdomen proving flat on percussion, there may be crepitation on auscultation, there is continuous pain with exacerbations (not complete intermissions), and there is rather a careful mode of lying down. In =intestinal constipation= or other =obstruction=, fæces may be passed at first in small pellets coated with mucus or they may be at first passed freely but in steadily lessening quantities until they stop altogether. The pain is constant but worse at one time than another and in case of external hernia the swelling will be visible. In =helminthiasis= there is the general unthriftiness, irregular appetite, frizzled broken hair on the base of the tail, a fur of dried mucus around the anus and the presence of parasites in the droppings.