EXPLANATION OF PLATE XXXVIL 

 THE SKIN. AND SOME OF THE PARASITES. 



1. Tick, infests Dogs and Sheep. 



2. Tick, or Ked of Sheep, enlarged. 



3. Sheep Louse, enlarged. 



4. Pig Louse, do. 



5. Cow Louse, do. 



6. Horse Louse, do. 



7. Ox Warble Fly. 



8. Ox Warble Maggot. 



9. Ox Warble Chrysalis. 

 10. Section of Skin. 



a. Duct of Sweat Gland. 



h. Sweat Gland. 



c. Hair Follicle. 



d. Hair Bulb. 



e. Sebaceous or Oil Gland 



