454 



THE MICROSCOPE. 



examined under the microscope, our disgust of it is in no 

 way diminished. In the head may be distinguished two 



3, Head of Cat-Flea. 4, Larva, or grub of 



1, Dog's parasite. 2, Rat Arams. 3, Head of Cat-Flea. 4, La 

 Flea. (The lii'e size of each is given in the small circl 



les.) 



large eyes, and near to them are the two antennae ; the 

 front o'f the head is long, and somewhat tapering off to 

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



