THE CONQUEST OF DISEASE 



animals in cows, pigs, birds, and even in 

 fishes. One of the earliest animal experiments 

 was the capturing of monkeys in their out-door 

 homes in the forests and confining them in 

 cages in zoological museums. From this ex- 

 periment we learned that they die of tubercu- 

 losis. Most of the monkeys in captivity die of 

 this disease. A similar experiment was prac- 

 ticed upon the Fuegians. When our mission- 

 aries went among these people they found a 

 hardy race, living a simple life out of doors. 

 The missionaries taught them that this was not 

 nice, and had them build little houses to shut 

 themselves up in the same as we do. When 

 Senn visited these people he found the villages 

 of little white houses, and in almost every 

 house he found a huge Fuegian breathing away 

 his life with tuberculosis, and the beautiful 

 little cemeteries back of the villages models 

 of conventional propriety and activity. This 

 is animal experiment number two. 



In 1886 Trudeau demonstrated upon ani- 

 mals the influence of favorable environment. 

 Inoculated rabbits placed under the unfavor- 

 able influences of want of proper light, air and 

 food perished of tuberculosis, while inoculated 

 rabbits turned out in the open air with abund- 



68 



