Impaction of the Oiiiasjiin ( Third Sto>iiach). 123 



Like the bacterial fennents the\' doubtless assist in the disintegra- 

 tion of the mass of food. 



Amphistomum Conicum. This is a treniatode worm about the 

 size of an apple-seed ( 10 millimetres long by 2 millimetres thick), 

 rounded at both ends, slightly curv^ed on itself, and, as usually 

 found, of a bright red color. It attaches itself by its sucker (on 

 tliick end), usually in the vicinity of tlie deniicanal. Its life 

 history is closely allied to that of the distoinata, but as it is not 

 known to prove at all injurious to its host, it possesses no patliolo- 

 gical importance. 



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 characteri.stic yellow 

 granules made up of club-shaped cells, though the usual .stellate 

 arrangement maj' be somewhat imperfect. From the serous sur- 

 face 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 el.sewhere, the same general treatment with iodide of 

 potassium will dispose of these formations as well. 



IMPACTION OF THE OMASUM (THIRD STOMACH). 



Definition. Synon3'nis. Causes, torpid action, defective insalivation, in- 

 active riimen, fever, inflanmiation, spinal paresis, dry, fibrous, innutrilious 

 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, diarrhoea, constipa- 

 tion, baked coated faeces, percussion signs, separation from herd, red eyes, 

 stififness, agalactia, foetid eructations, paralysis, drowsiness, stupor, de- 

 lirium, 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, petechise, ulceration, empty, and congested abomasum and .small 



