OF THE HUMAN SKIN. 



45 



surface, whilst the mite has gone along further 

 with its burrow. An animal, when it gets on to 

 the skin, crawls till it finds a suitable soft place, 

 when it tips up on its fore-legs, and commences 

 to work its way in. The female, as it progresses, 

 lays its eggs behind her in the burrow, and when 



c 



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I'ir/. 5. 



Fig. 6. 



Fig. 7. 



exhausted, dies. These eggs will be seen, in a 

 regular row behind the female, in the burrow, 

 under the microscope with one himdred multiply- 

 ing power. It is not settled how long it takes 

 the eggs to hatch — from seventy hours to six or 



