146 



Insects and Disease 



taken to prevent infection from other sources and 

 that not enough definite evidence was produced. 

 Against this claim much negative evidence was 

 considered and the final conclusion was "that suc- 

 torial insects do not come under consideration in 

 connection with the spread of plague." 



In 1905 another body of men known as the Ad- 

 visory Committee was appointed to arrange for 

 further studies in India and other places, particu- 

 larly in relation to the mode of dissemination of the 

 disease. They at once appointed a new working 

 commission who immediately began their studies 

 and experiments. The preliminary reports of their 

 work, which are still known as the Reports of the 

 Indian Plague Commission, as well as the reports 

 of contributing investigations that are being made 

 from time to time, have served to establish entirely 

 Dr. Simond's claims and have completely revolu- 

 tionized the methods of fighting plague. 



There are several different types of plague, seem- 

 ing to depend largely on the manner of infection. 

 The most common type is that known as the bu- 

 bonic plague which is characterized by buboes or 

 swellings in various parts of the body. This form 

 of infection is usually received through the skin 

 in some manner or other. Only rarely does direct 

 man-to-man infection occur though there is always 



