DISEASES OF THE HOG. 234 
were possible, in all likelihood, we would have the 
key 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 
2mm. objective and number 8 ocular; X1000. 
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. 
