Four hundred years ago a little boy called Bernard Palissy was born in a village of France, not very far from the great river Garonne. The country round was beautiful at all times of year--in spring with orchards in flower, in summer with fields of corn, in autumn with heavy-laden vines climbing up the sides of the hills, down which rushing streams danced and gurgled. Further north stretched wide heaths gay with broom, and vast forests of walnut and chestnut, through which roamed hordes of pigs, greedy after the fallen chestnuts that made them so fat, or burrowing about the roots of the trees for the truffles growing just out of sight. When the peasants who owned the pigs saw them sniffing and scratching in certain places, they went out at once and dug for themselves, for, truffles as well as pigs, were thought delicious eating, and fetched high prices from the rich people in Perigueux or even Bordeaux. But the forests of the province of Perigord contained other inhabitants than the pigs and their masters, and these were the workers in glass, the people who for generations had made those wonderful coloured windows which are the glory of French cathedrals. The glass-workers of those days were set apart from all other traders, and in Italy as well as in France a noble might devote himself to this calling without bringing down on himself the insults and scorn of his friends. Still, at a time when the houses of the poor were generally built of wood, it was considered very dangerous to have glass furnaces, with the fire often at a white heat, in the middle of a town, and so a law was passed forcing them to carry on their trade at a distance. In Venice the glass-workers were sent to the island of Murano, where the factories still are; in Perigord they were kept in the forest, where they could cut down the logs they needed for their kilns, and where certain sorts of trees and ferns grew which, when reduced to powder, were needed in the manufacture of the glass. * * * * *