IX 



Experi- 

 mental 

 methods 

 essential. 



Trichinae. 



ANIMAL EXPERIMENTATION AND DISEASES OF 

 THE LOWER ANIMALS 



Animals as well as man reap the benefit of 

 animal experiment. The great problems of 

 animal industry can not be solved by statistics 

 and calculations from the easy chair. The in- 

 fectious and epizootic diseases continued their 

 ravages until their causes and natures were 

 discovered by scientific experimentation. We 

 have seen what has been done with anthrax, 

 malignant edema, hog cholera, chicken cholera, 

 silk-worm disease, hydrophobia, and bubonic 

 plague. Contagious pleuro-pneumonia, Texas 

 fever and foot-and-mouth disease also have 

 been brought under subjection. 



The trichinae problem in the United States, 

 dealing with a small worm that attacks pork, 

 which for many years involved an annual loss 

 to trade of fifty million dollars, has been 

 worked out by the investigations of the De- 

 partment of Agriculture, and means for over- 



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