PLATE XL 



PAKASITES. 



1. IjOUSE, huhah; magnified 50 diameters. 



2. AcAETJs DOMEBTicuB, Cheese-Mite; magnified 50 diameters. 



3. Sarcoptes bcabiei, Itch-Insect; magnified 350 diameters. 



4. Dehodex folliculobum, of Gnib from Human Skin, in its varioim stages of 



existence, from the Egg upwards ; magnified 250 diameters. 



(THE SHALL CIKCLE8 EKCL08E THE OBJECTS OP THE NATT7BAL SIZE.) 



