_.. 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 OF THE SEIN, 
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 papille; B, Cutis; d, arterial twig supplying its vascular 
| papille; ee, perspiratory glandule; f, cluster of fat-cells ; g g, perspiratory duct, 
_ traversing the true skin; 4, its continuation through the epidermis; i, tactile 
L papillz, with their nerves. 
‘This is the more probable from the fact that we find these 
‘vascular papille very large and full of blood-vessels in the 
Anterior of corns, warts, and other such productions, formed 
by a “hypertrophy” or over-nutrition of the epidermis in 
articular spots ; and also in situations in which the ordinary 
dermis is very thick, as it is on the black pads of the foot 
the dog or cat. And a highly vascular structure of the 
