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 it became necessary to survey the salt-marshes in the neighbourhood of Saintes for the purpose of levying the land-tax. Palissy was employed to make this survey, and prepare the requisite map. The work occupied him some time, and he was doubtless well paid for it; but no sooner was it completed than he proceeded, with redoubled zeal, to follow up his old investigations "in the track of the enamels." He began by breaking three dozen new earthen pots, the pieces of which he covered with different materials which he had compounded, and then took them to a neighbouring glass-furnace to be baked. The results gave him a glimmer of hope. The greater heat of the glass-furnace had melted some of the compounds; but though Palissy searched diligently for the white enamel he could find none.

For two more years he went on experimenting without any satisfactory result, until the proceeds of his survey of the salt-marshes having become nearly spent, he was reduced to poverty again. But he resolved to make a last great effort; and he began by breaking more pots than ever. More than three hundred pieces of pottery covered with his compounds were sent to the glass-furnace; and thither he himself went to watch the results of the baking. Four hours passed, during which he watched; and then the furnace was opened. The material on one only of the three hundred pieces of potsherd had melted, and it was taken out to cool. As it hardened, it grew white—white and polished! The piece of potsherd was covered with white enamel, described by Palissy as "singularly beautiful!" And beautiful it must no doubt have been in his eyes after all his weary waiting. He