328 



THE MICROSCOPE. 



hunger seize upon mankind, this horrid parasite seldom fails to appear 

 in the train of such calamities, and to increase in proportion as neglect 

 of personal cleanliness engenders loathsome disease. When examined 

 under the microscope, our disgust of it is in no way diminished. In the 



fig. 157. 



1. Dog's Parasite. 2. Eat Acarus. 3. Head of Cat-Flea. 4. Larva or grub of Flea. 

 The life size of each is shown within the small circles. 



head may be distinguished two large eyes, near-to which are situated 

 the antennae ; the front of the head is long, and somewhat tapering 

 off to form a snout, which serves as a sheath to the proboscis and the 

 instrument of torture with which it pierces the flesh and draws the 

 blood. To the fore part of its body six legs are affixed, having each 



