FOR some time past the daily Press has been interested in the production of diamonds artificially. Long articles have been written upon the subject, and various persons, scientific and otherwise, interviewed, owing to the prosecution of M. Lemoine by Sir. Julius Wernher on account of his failure to produce diamonds by chemical means after he had stated he was able to do so, and, in fact, had promised to produce diarfionds of very large size at a price which would compete readily with the natural -product. However, after obtaining large sums of money to build a factory, and apparently carrying out experiments in which small diamonds were supposed to be obtained, M. Lemoine entirely failed to produce large ones. When diamonds said to have been produced in the crucibles were critically examined, experts were able, not only to assure the magistrate that these diamonds were not artificial, but were also able in several cases to identify them as stones which had been bought from known sources. The whole case hinged upon a certain envelope which was originally lodged in an English bank, and, in which it was stated a formula was contained by means of which diamonds could be produced artificially. On Tuesday, June 16, this envelope was to be opened before the magistrate, but in the meantime the modern alchemist had vanished. When the letter was opened, according to the Times of June 18, the following particulars were found:-