PLATE XI. 



PARASITES. 



1. LOUSE, HUMAN; magnified 50 diameters. 



2. ACABUS DOMESTICUS, Cheese-Mite; magnified 50 diameters. 



3. SARCOPTES SCABIEI, Itch-Insect; magnified 350 diameters. 



4. DEMODEX FOLLICULORUM, or Gmb from Human Skin, in its various stages of 



existence, from the Egg upwards ; magnified 250 diameters. 



(THE SMALL CIRCLES ENCLOSE THE OBJECTS OF THE NATURAL SIZE.) 



