"Cavendish's earliest public contribution to science was... his paper on Factitious Airs, published in the Transactions of the Royal Society for 1766. It consisted of three parts: a fourth, which was not published, remains in a state of perfect completion, ready for the press, among his papers. It was evidently intended to be read to the Royal Society, for it contains a reference to the "Former Experiments read to this Society." ...since ...published by the Rev. W. V. Harcourt."