When it becomes necessary to make an extreme transition from one ration to another, and especially from dry to green food, measures should be taken to make the change slowly, by giving the new food in small quantities at intervals, while the major portion of the diet remains as before, until the fæces indicate that the superadded aliment has passed through the alimentary canal. Another method is to mix the dry and green aliments with a daily increasing allowance of the latter. Some have avoided the morning dew and danger of fermentation by cutting the ration for each succeeding day the previous afternoon and keeping it in the interval under cover. _Treatment._ Various simple mechanical resorts are often effective in dispelling the tympany. Walking the animal around will sometimes lead to relaxation of the tension of the walls of the demicanal and even to some restoration of the movements of the rumen with more or less free eructation of gas. The dashing of a bucket of cold water on the left side of the abdomen sometimes produces a similar result. Active rubbing or even kneading of the left flank will sometimes lead to free belching of gas. The same may be at times secured by winding a rope several times spirally round the belly and then twisting it tighter by the aid of a stick in one of its median turns. A very simple and efficient resort is to place in the mouth a block of wood 2½ to 3 inches in diameter and secured by a rope carried from each end and tied behind the horns or ears. This expedient which is so effective in preventing or relieving dangerous tympany in choking appears to act by inducing movements of mastication, and sympathetic motions of the œsophagus, demicanal and rumen. It not only determines free discharge of gas by the mouth, but it absolutely prevents any accession of saliva or air to the stomach by rendering deglutition difficult or impossible. A similar effect can be obtained from forcible dragging on the tongue but it is difficult to keep this up so as to have the requisite lasting effect. Still another resort is to rouse eructation by the motions of a rope introduced into the fauces. The passing of a hollow probang into the rumen is very effective as it not only secures a channel for the immediate escape of the gas, but it also stimulates the demicanal and rumen to a continuous eructation and consequent relief. Friedberger and Fröhner advise driving the animals into a bath of cold water.