dis£:ases of tiie hog. 227 



were possible, in all likelihood, we would have the 

 ]:ey to prevent the outbreaks of the disease, which 

 we certainly have not at the present time. Hog- 



Figure 18. Hog Cholera. 



Photograph by Dr. T. J. Burrill, with Zeiss apochromatic 

 2 mm. objective and number 8 ocular ; XIOOO. 



cholera germs are slightly larger and more elon- 

 gated than those of swine plague; they are pro- 

 vided with flagella or long thread-like appendages, 

 which enable them to move rapidly in liquids; 

 while the swine plague germs (Fig. 19) have no 

 such organs and are unable to move except as they 

 are carried by the liquid in which they float. 



