OF THE HU3IAN SKIN. 



35 



hiuiclredth to one-fiftieth of an inch in length. 

 Our figure here saves us any minute description 

 of this parasitic animal. The true pimple mite 

 was found by Henle and Gustav Sii|ion, in 1842, 

 almost simultaneously, and independently of each 



Fig. 3. 



other. They are found generally and most abun- 

 dantly in the glands of the skin which secrete the 

 grease, either opening on the surface, or into a 

 follicle, from which the hair springs. They are 

 of very frequent occurrence, it even being as- 

 serted that no one is free from them, and are dis- 

 covered in the sebaceous glands of the face, chin, 

 nose, and forehead, by pressing out the contents 

 of the gland, and adding a drop of colored oil to 

 it on the glass slide of the microscope. They 



