A 6-year-old Holstein cow was admitted to Stange Memorial Clinic on May 7, 1946. The history, according to the owner, was that the animal showed difficult breathing, anorexia and abdominal pain. The owner was an exceptionally good feeder, but the animal had been fed some corn fodder. The local veterinarian made a tentative diagnosis of ruminal impaction. He treated the animal on the first day by giving it 2 pounds of magnesium sulfate orally. The second day the animal was given 1 gallon of mineral oil. The animal showed no relief on the third day and was given 5 mgm. of lentin subcutaneously. No medication was given on the fourth day and the animal was brought to the clinic on the fifth day.