THE EPIDERMIS. 



many layers, and united by a small amount of cementing 

 substance. The deepest layer, d, is composed of elongated 



x a 



FIG. 75. A section through the epidermis, somewhat diagrammatic, highly 

 magnified. Below is seen a papilla of the dermis, with its artery, /, and veins, 

 gg; a, the horny layer of the epidermis; 6, the rete muscosum or Malpighian 

 layer; d, the layer of columnar epidermic cells in immediate contact with the 

 dermis; 7i, the duct of a sweat-gland. 



or columnar cells, set on with their long axes perpendicular 

 Describe the epidermis. 



