352 DR. LEGEAR'S STOCK BOOK. 



persons accustomed to such researches. The hog cholera germs 

 are slightly larger than those of swine plague. They are pro- 

 vided with long, thread-like appendages, which enable them to 

 move rapidly in liquids, while the swine plague germs have no 

 such organs, and are unable to move in like manner. 



Both diseases are produced by injecting cultures (growths) of 

 their respective germs directly into the blood vessels. 



From results of experiments with these two diseases, it has 

 been found that the germs of hog cholera find their way into the 

 bodies of swine mainly with the food and drink, and with the air; 

 while those of swine plague are taken almost entirely with the 

 air, or, in other words, they gain entrance through the lungs in 

 nearly every case-. 



Hog cholera germs are very hardy and vigorous, while those 

 of swine plague are very delicate and easily destroyed. Hog 

 cholera germs are able to multiply and live for a long time in the 

 water of ponds and streams; they may live in the soil for at least 

 three months, and amongst straw and litter for a much longer 

 time; they withstand drying in a remarkable manner. Swine 

 plague germs, on the contrary, soon perish in water or by drying; 

 the temperature for their growth must be more constant, and 

 every condition of life more favorable, than is required for the 

 hog cholera germs. 



Symptoms. In the most severe forms of the disease the ani- 

 mals die very suddenly, either before sickness has been observed 

 or after they have been ill but a few hours. Such cases are 

 usually seen at the beginning of an outbreak. In the majority 

 of cases the progress of the malady is slower, and, fortunately, 

 giving an opportunity to observe the symptoms. There are no- 

 ticed signs of fever, shivering, unwillingness to move, loss of 

 appetite more or less, elevation of temperature, which may reach 

 106 to 107 degrees Fahrenheit; the animals appear stupid and 

 dull, and have a tendency to hide in the litter or bedding and 

 remain covered by it. The bowels may be natural at first, but 



