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Thorns, that in the "bush" will rip the best pair of British-made marching-boots to shreds in a very short time, trouble him hardly at all, for the soles of his feet, which with the palms of his hands are the only white parts of his epidermis, are as hard as iron. "All my kit ready, Tarry Barrel?" enquired Wilmshurst as he sipped his tea.
They scrub off the delicate epidermis, as well as the natural oil in it, and leave it dry and irritated and ready to crack open. Then more dirt gets into the cracks just formed, and more scrubbing with bristles and hot water and soap is indulged in to get it out. This opens the cracks still further, and the next layer of dirt is worked in still deeper.
This displacement of the mouth from front to rear is very interesting, because it corresponds to a phylogenetic displacement of the mouth. In most of the Turbellaria there is a narrow cavity, containing a number of secondary organs, between the two primary germinal layers, the outer or animal layer of which forms the epidermis and the inner vegetal layer the visceral epithelium.
Perhaps some trick of constitution or some singularity of the nervous system renders them immune to the poison, as the orange pigment said to reside in their epidermis protects them from the actinic rays of the sun. Does not Darwin assert that while white sheep and pigs are upset by certain plants dark-coloured individuals escape.
"Foak bea n't a-gwean ter walk on hutheh foak," he remarked calmly. "Hordehs is hordehs," he argued, as the good arrow-point penetrated his epidermis, fair in the vulnerable spot. I laughed contemptuously. "Fat lot you care for orders! A man in your position talking about orders! Get out!" The point was forcing its way through the sensitive second-skin, or cutis. "Do!"
"As only one areola belongs to each cell, and as in many cases where it exists in the common cells of the epidermis, it is also visible in the cutaneous glands or stomata, and in these is always double one being on each side of the limb it is highly probable that the cutaneous gland is in all cases composed of two cells of peculiar form, the line of union being the longitudinal axis of the disk or pore.
Similarly is it with the organs for smelling and hearing. These, too, begin as sacs formed by infoldings of the epidermis; and while their parts are developing they are joined from within by nervous structures which were themselves epidermic in origin. How are we to interpret these strange transformations?
Sore feet constitute a frequent and troublesome complaint. It consists of inflammation of the vascular substance, between the epidermis and the parts beneath. It is the result of numerous slight contusions, produced by long travelling in dry weather, or hunting over a hard and rough country, or one covered with frost and snow.
'Ho! pooh! one of those fabulous tumours of the epidermis mentioned by Pliny, you know, exploded ten centuries ago ha, ha, ha! and he winked and laughed derisively, and said, 'Sure you know Doctor Walsingham. And the gentlemen began spouting their theories about the murder and Nutter, in a desultory way; for they all knew the warrant was out against him.
This still undifferentiated tissue forming the base of the epidermis, and existing also as a source of renewal in internal organs, is the essentially living substance; and facts above given imply that it was the action of the medium on this essentially living substance, which, during early stages in the organization of the Metazoa, initiated that protective envelope which presently became an inherited structure a structure which, though now mainly inherited, still continues to be modifiable by its initiator.
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