HOG DISEASE. 249 



feed, before the system has become accustomed to 

 the change. This also explains why it is that the 

 most vigorous and thrifty are attacked, while the 

 poorer ones are generally exempt. OVERHEATING 

 by exposing the herd to very hot sun without shade, 

 or exposing to cold chilly, rainy weather without 

 shelter, or, worse than either, permitting them to over- 

 heat or overlay each other in straw stacks or similar 

 close quarters from which reeking with heat, they be- 

 come chilled by coming out into the bleak wind to 

 feed. Such exposure is almost sure to result in con- 

 gestion and inflammation of the lungs. KEEPING 

 SWINE TOO DIRTY, the skin being covered with mud, 

 scurf or vermin, thus closing the pores and arresting 

 the natural excretory function. If the function of 

 the skin is thus arrested, the kidneys, lungs, glands, 

 and mucuus and serous membranes, must either 

 perform this extra duty, or disease will result, as it 

 does in " Hog Cholera," and hence these organs are 

 so often found affected in this disease. IMPURE 

 DRINKING WATER into which the drainings of the 

 barn yard run or that which is foul from refuse 

 or stagnant matter, produces typhus in a household 

 and will produce malignant disease in swine. 



Lastly, INFECTION FROM BEING WITH SICK Or DEAD 



, SWINE or EATING OF SUCH. It is even asserted 

 that hogs eating the grass that grows on the 

 ground where the dead of this disease have 

 been buried, will be infected. We must remember 

 that all similar diseases have a tendency to assume 



