A fine thread-like substance, of various forms and colors, developed from the outer skin of mammals. Each hair consists of a shaft and root. The shaft or part above the skin does not grow, but the bulb or part under the skin, which is made up of little cells, grows by forming new cells, the old ones being pressed forward, and becoming a part of the shaft. Its color is said to be caused by a kind of oil which comes from the cells in the bulb. Porcupine quills, hedgehog spines, and rhinoceros horn are all developments of hair. Straight hair is nearly round, but curly or crisp hair, like that of the negro, is flattened, and the hair of the Bushman in Africa is nearly as flat as a ribbon. Hair is very strong 'and very lasting. It is also very elastic or springy, and for this reason is much used for stuffing cushions, mattresses, sofas, etc. Horse hair is used for making hair-cloth and other purposes, and the hair of cows, camels, goats, and dogs is used for weaving, and the hair and fur of beavers, rabbits, and other small animals for making felt. Hogs' hair and bristles are largely used in brush-making. Human hair is used chiefly for making wigs, curls, etc. Most of it comes from France, Italy, Germany, Russia, and South America. Young peasant women sell their hair to wandering dealers, who go round to collect it. These sell it to hair-merchants, who partly dress it, and sell it again to the wig-makers. Human hair is also plaited into ornamental work, such as chains, and pictures and this has in some

HAIR MAGNIFIED. E, Shaft; F. Root G, Fat Cells.

HAIR MAGNIFIED. E, Shaft; F. Root G, Fat-Cells.