On April 3, 1951, a bay mare was presented at the Stange Memorial Clinic for treatment of severe diarrhea. The patient was extremely emaciated and dehydrated; the anal sphincter apparently had little or no tonus. A fecal examination showed the presence of numerous Strongylidae ova. A blood analysis showed 61.5 percent hemoglobin and as the extreme dehydration had caused a hemoconcentration the anemia was actually worse than this would indicate.