Besides carrying on the manufacture of pottery, with the aid of his two sons, Palissy, during the latter part of his life, wrote and published several books on the potter’s art, with a view to the instruction of his countrymen, and in order that they might avoid the many mistakes which he himself had made. He also wrote on agriculture, on fortification, and natural history, on which latter subject he even delivered lectures to a limited number of persons. He waged war against astrology, alchemy, witchcraft, and like impostures. This stirred up against him many enemies, who pointed the finger at him as a heretic, and he was again arrested for his religion and imprisoned in the Bastille. He was now an old man of seventy-eight, trembling on the verge of the grave, but his spirit was as brave as ever. He was threatened with death unless he recanted; but he was as obstinate in holding to his religion as he had been in hunting out the secret of the enamel. The king, Henry III., even went to see him in prison to induce him to abjure his faith. “My good man,” said the King, “you have now served my mother and myself for forty-five years. We have put up with your adhering to your religion amidst fires and massacres: now I am so pressed by the Guise party as well as by my own people, that I am constrained to leave you in the hands of your enemies, and to-morrow you will be burnt unless you become converted.” “Sire,” answered the unconquerable old man, “I am ready to give my life for the glory of God. You have said many times that you have pity on me; and now I have pity on you, who have pronounced the words _I am constrained_! It is not spoken like a king, sire; it is what you, and those who constrain you, the Guisards and all your people, can never effect upon me, for I know how to die.” {80a} Palissy did indeed die shortly after, a martyr, though not at the stake. He died in the Bastille, after enduring about a year’s imprisonment,—there peacefully terminating a life distinguished for heroic labour, extraordinary endurance, inflexible rectitude, and the exhibition of many rare and noble virtues. {80b}