=Actinomycosis of the Rumen and Reticulum.= Tumors of this fungus are sometimes found in the walls of the two first stomachs projecting in the form of polypi, or imbedded in the thickness of the coats. Where they are completely covered by the mucous or serous membrane their true nature is not readily recognized. When incised they show the characteristic yellow granules made up of club-shaped cells, though the usual stellate arrangement may be somewhat imperfect. From the serous surface the growth may invade the different adjacent organs. It is impossible to diagnose a primary actinomycosis of the rumen, if unaccompanied by more superficial lesions, but, if the disease is recognized elsewhere, the same general treatment with iodide of potassium will dispose of these formations as well. IMPACTION OF THE OMASUM (THIRD STOMACH). Definition. Synonyms. Causes, torpid action, defective insalivation, inactive rumen, fever, inflammation, spinal paresis, dry, fibrous, innutritious food, fungi, ergot, smut, privation of water, or of succulent food, microbian ferments and their products, chronic heart disease, dry farinas, extreme changes of diet, brain disease. Symptoms: slight or violent; ill health, impaired appetite and rumination, grunting, tympany, diarrhœa, constipation, baked coated fæces, percussion signs, separation from herd, red eyes, stiffness, agalactia, fœtid eructations, paralysis, drowsiness, stupor, delirium, nervous symptoms mostly in acute cases. Course in chronic and acute cases. Diagnosis; from pneumonia, and overloaded rumen. Lesions; solid impacted omasum, baked contents, shedding of epithelium, congestion, petechiæ, ulceration, empty, and congested abomasum and small intestine. Treatment: laxative food, purgatives, stimulants, antiseptics, enemata, stimulants of peristalsis, counter-irritants, mucilages, laxative diet, tonics. _Definition._ This may be defined as a form of indigestion of which the prominent feature is the drying and impaction of the ingesta between the folds of the third stomach. It may seem to be a primary disease, but in very many cases it occurs as a result of some acute febrile or inflammatory affection. _Synonyms._ As the disease has been long popularly known it has received a variety of popular names which are more or less characteristic. Dry murrain, Clewbound, Fardelbound, Stomach staggers, Grass staggers, Vertigo, Chronic dyspepsia, and Chronic indigestion may serve to illustrate these.