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 return to England proceeded to experiment. His operator and assistant in these investigations was Ambrose Godfrey Hanckwitz, who became the founder of a London pharmaceutical business which still exists. Ultimately Boyle and Hanckwitz were completely successful, and for many years the "English phosphorus" supplied by Hanckwitz from his laboratory in Southampton Street, Strand, monopolised the European market. According to a pamphlet published by him, entitled "Historia Phosphori et Fama," the continental phosphorus was an "unctuous, dawbing oyliness," while his was the "right glacial" kind.

In 1680 Boyle deposited with the Royal Society, of which he was then president, a sealed packet containing an account of his experiments and of his process for the production of the "Icy Noctiluca," as he called his phosphorus.

It is related in the Memoirs of the Academy of Sciences of Paris for 1737 that in that year a stranger appeared in Paris and offered for a stipulated reward to communicate the process of making phosphorus to the French Government. A committee of the Academy, with Hellot as its president, was appointed to witness the stranger's manipulation. According to the report of this committee, the experiment was completely successful.

It only remains to add, to complete the history, that in 1769, Gahn, a Swedish mine-owner, discovered phosphorus in bones, and that working from this observation Scheele in 1775 devised the process for the manufacture of phosphorus which is still followed.

Such a remarkable substance as phosphorus, extracted as it had been from the human body, was evidently marked out for medical uses. Experiments were soon commenced with it. Kunckel's "luminous pills" were