Excretion. 



in flakes (those from the scalp are called dandruff) from 

 all the surface of the skin, and new cells are continually 

 formed in the deeper layers. 



Mouth of Sweat Duct 



Horny Epider- 

 mis 



Soft Layer - 



Papilla 



Dermis 



Vein Artery 



Fig. 65. Section of Epidermis, showing Papilla. (Highly magnified.) 



The Color of the Skin. The coloring matter, or pig- 

 ment, of the skin lies in the deeper layer of the epidermis. 

 In albinos the pigment is wanting. In persons with fair 

 skin it is small in amount, in dark skins more abundant. 

 Where the pigment is scattered irregularly it causes 

 freckles, etc. 



A Blister. A blister is caused by separating the outer, 

 harder layer of the epidermis from the inner, softer, darker 

 layer of the epidermis, as at B, in Fig. 64. Serum, or 

 blood, fills the space between the separated layers. 



