Daguerre's announcement was a source of dismay to the English scientist William Henry Fox Talbot, who had been experimenting independently along related lines for years. Talbot had evolved a method for making a paper negative from which an infinite number of paper positives could be created. He had also worked out an effective although imperfect technique for permanently “fixing” his images. Concerned that he might lose the rights to his own invention, the calotype process, Talbot wrote to the French Academy of Sciences, asserting the priority of his own invention. He then lost no time in presenting his researches to England's Royal Society, of which he was a distinguished member.
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