The wool is not so easily converted into balls as is hair, but it soon accumulates in the pyloric region or in the intestine, and forms obstructing masses. The little patients lose appetite and lie down in corners, where they are found dead after twenty-four to forty-eight hours. The masses of wool or of hair are rarely passed with the excrement; more frequently they are vomited, but this again is exceptional; usually they become arrested at the entrance to the pylorus. The lambs show colic, tympanites of the abomasum, and attempts at vomiting, though unfortunately these are often overlooked. The quantity of wool found in the abomasum and intestine on post-mortem examination may be considerable, in relation to the size of the digestive compartments. Death results from intestinal obstruction, exactly as in the case of calves. These aberrations of appetite in lambs have been considered as due to the want of sufficient mineral salts in the mother’s milk; and it has been stated that the lambs practise this habit because of the laxative result of the fat contained in the wool swallowed. The explanation seems very logical, though it is by no means perfectly proved. It is certain that this habit becomes particularly common after years in which forage has been scarce and among flocks in bad bodily condition. The force of example also plays a certain part, and animals probably imitate one another, and so acquire the disease. This explains the importance of early segregation. =Diagnosis.= The diagnosis of depraved appetite, pica, or the licking habit presents no difficulty; but it can only be arrived at by the cowman or shepherd, for the symptoms can only be detected by continued watching. The diagnosis of pyloric or intestinal obstruction is very difficult in the absence of information. It becomes easy after the first post-mortem examination has been made. =Prognosis.= The prognosis is grave. In calves, obstruction of the bowel by hair balls inevitably causes death, and in sucking lambs the mortality may be high: as much as 15 per cent. to 20 per cent. according to the observations of several observers. The mortality occurs about the age of six weeks to two months, whilst the licking habit may begin towards the end of the second week. =Treatment.= Prophylaxis demands that the mothers (whether cows or ewes) be well fed. An excellent precaution consists in adding to the food a sufficient quantity of salt and of phosphate of lime (2 drams to 2½ drams of each). This treatment of the mothers is necessary as soon as the tendency to licking becomes manifest. In calves the best method of avoiding fatal results is to prevent the young animals licking one another; and the method now usually practised on well-managed farms consists in applying a simple muzzle of wicker work immediately after each meal.