STAGGER GRASS AS A POISONOUS PLANT. 11 



the case the sheep was killed and an autopsy made which showed noth- 

 ing abnormal in the internal structures. Material of the liver, lung, 

 kidney, and spleen was turned over to Dr. A. R. Ward, of the Patho- 

 logical Division, Bureau of Animal Industry, who made the follow- 

 ing report: 



Autopsy on Sheep No. 228. 



Liver. — The organ is normal to all intents and purposes. ■ The hepatic cells 

 took the staining well, and a good contact between the cytoplasm and karyo- 

 plasm is present in the well-marked lobules. There is no congestion, no inflam- 

 mation, nor any cell .proliferation of any kind. However, if we wish to be 

 hypercritical, there appears a very slight, cloudy swelling with minute areas 

 of serous fluid in the hepatic cells nearest to the capsule of Glisson. 



Fig. 8. — Sheep No. 228 at 10.09 a. m., April 8, 1914. 



Lung. — Pleura thickened. Subendothelial capillaries prominent but empty. 

 The air cells, infundibula, and pulmonary epithelium show no deviation from 

 the normal. The smaller bronchial tubes are normal, but the larger ones show 

 a slight peribronchial cell infiltration but no catarrh. 



Kidney. — Capsule normal. Renal capillaries show no alteration except those 

 constituting the glomeruli, which appear to be distended. There is a moderate 

 number of red blood corpuscles which have passed into the capsule of Bow- 

 man. No parenchymatous and no interstitial changes are present. 



Spleen. — Neither the splenic pulp nor the splenic corpuscles show any altera- 

 tion. There is a small excess of hematogenous pigment, indicating that a num- 

 ber of red blood corpuscles have been disintegrated in the spleen. 



GENERAL CONCLUSIONS. 



TOXIC DOSE. 



The only animals used for experimental purposes were cattle and 

 sheep, and the number of experiments was too small to determine the 

 dosage with any exactness. The fact that the symptoms sometimes 



