STRUCTURE 



203 



Fat is placed in this lower layer of the skin appar- 

 ently for the double purpose of serving as a storage for 

 food supply which can be utilized when needed, and also 

 of forming a thick layer of non-conducting material for 

 the protection of the body against a too rapid loss of 



Shaft of hair 



_ Horny layer of skin 

 ^-Duct of sweat gland 

 Papilla' 

 Capillaries of papillae 



Epidermis'' 



Dermis- 



Subcutaneous tissue- 



Sebaceous glands 

 Connective tissue 



muscle of hair 



I of sweat gland 



to sweat gland 

 pilla of hair 

 ve tissue 



Fio. 111. Section of skin, considerably magnified. 



heat in cold weather. When the partial or complete 

 starvation of prolonged illness or th4 partial failure of 

 digestion and assimilation, as m old dge, has caused this 

 supply of fat to be used up, ifie skin is no longer filled 

 out and becomes wrinkled. It is for this reason that 

 age shows itself most quickly in those who are thin. 



Hair. Tn this fatty laye? are embedded folds of the 

 epidermis and dermis in wb'ch lie the roots of the hairs 

 and nails. The hairs pass f om the surface into the fatty 

 layer through tiny canals lightly larger than the hairs- 



