“That is a little contrivance of the sebaceous glands, which secrete the fatty, albuminous substance that oils your skin and keeps it supple, and pleasant to feel of. Not very appetizing, maybe, but without it the skin would be all withered and cracked. Without the cholesterin, it is hard to imagine touching the human skin at all. These sebaceous glands have little erector-muscles that act upon them, and when they do so, then you are like the lad when the princess poured the pail of minnows over him. Your skin gets like a file, and if the stimulus is very powerful, the hair ducts are erected too, the hair on your head bristles up and the little hairs on your body, like quills upon the fretful porcupine⁠—and you can say, like the youth in the story, that now you know how to shiver and shake.”