STRUCTURE OF THE SKIN. 



47 



(fig. 7, i i), which are commonly arranged in rows ; of these, 

 some are organs of touch, being furnished with sensory nerves 

 that end upon a peculiar cushion-like organ in their interior 

 ( 490); but into others no nerves can be traced, so that, 

 as these are copiously supplied with blood-vessels, it is pro- 

 bable that they minister to the .nutrition of the epidermis. 



Fig. 7. VERTICAL SECTION OP THE SKIN, 



Showing the different structures which it contains. A, Epidermis ; a a, its outer 

 surface ; a b, its horny layer ; b c its inner soft layer, dipping down into the 

 hollow between the papillae ; B, Cutis ; d, arterial twig supplying its vascular 

 papilla ; e e, perspiratory glandulae ; /, cluster of fat-cells ; g g, perspiratory duct, 

 traversing the true skin ; h, its continuation through the epidermis ; * , tactile 

 papillae, with their nerves. 



This is the more probable from the fact that we find these 

 vascular papilla very large and full of blood-vessels in the 

 interior of corns, warts, and other such productions, formed 

 by a "hypertrophy" or over-nutrition of the epidermis in 

 particular spots ; and also in situations in which the ordinary 

 epidermis is very thick, as it is on the black pads of the foot 

 of the dog or cat. And a highly vascular structure of the 



