We have lost most of our hairy coating, but whenever we get chilly, whether from cold or from fright, these little muscles of our hair bulbs contract and pull the hair glands of our skin up toward the surface, so that it looks all "pimply" or "goose-skinned." Each hair pouch has sprouted out from its sides a pair of tiny pouches, which form _oil glands_ to lubricate the hair and keep it sleek and flexible.

It is hard to beat nature at her own game, and her method of oiling the hair is far superior to any hair oil that can be put on from the outside.

Keep your hair well brushed and washed, and nature will oil it for you much better than any hair oil or scalp reviver ever invented.[19] THE NAILS How the Nails are Made.

Another "trade," which our wonderful skin has literally "at its fingers' ends," is that of making nails.

Indeed, every kind of scale, armor, fur, feather, and leather coating possessed by bird, beast, or fish was made by, and out of, the skin.