00 



ANIMAL COMPETITORS 



bed-bug, may do this; but the most common 

 agent is the flea. 



Another fact is that the rat seems especially 

 susceptible to the disease ; and, indeed, it is be- 



MOUTH-PARTS OF A BAT-FLEA, SHOWING WHERE BACILLI MAY 



CLING AND BE CARRIED INTO THE NEXT WOUND. 



From Doane's "Insects and Disease." By Permission of Henry 



Holt & Co. 



lieved that it was originally a disease of this 

 rodent. Rats abound in fleas, and, as is the 

 case with most furry or feathered animals, 

 have a species peculiar to their race. This 



