Having made this important discovery, Cookworthy appears to have determined at once to carry out his intention of making porcelain, and to secure the material to himself. To this end he went to London to see the proprietors of the land, and to arrange for the royalty of the materials. In this he succeeded; and ultimately Lord Camelford joined him in the manufacture of china, and, as appears from a letter of that nobleman to Polwhele, the historian of Cornwall, the two expended about three thousand pounds in prosecuting the work. The letter of Lord Camelford, which is dated “Boconnoc, Nov. 30, 1790,” is as follows:-- “With regard to the Porcelain Manufactory that was attempted to be established some years ago, and which was afterwards transferred to Bristol, where it failed, it was undertaken by Mr. Cookworthy, upon a friend of his having discovered on an estate of mine, in the parish of St. Stephen’s, a certain white saponaceous clay, and close by it a species of granite, or moor-stone, white, with greenish spots, which he immediately perceived to be the two materials described by the missionary Père D’Entrecolles, as the constituent parts of Chinese porcelain, the one giving whiteness and body to the paste, the other vitrification and transparency. The difficulties found in proportioning properly these materials, so as to give exactly the necessary degree of vitrification and no more, and other niceties with regard to the manipulation, discouraged us from proceeding in this concern, after we had procured a patent for the use of our materials, and expended on it between two and three thousand pounds. We then sold our interest to Mr. Champion, of Bristol.” It will be seen that Lord Camelford in this letter says that the discovery was made by a _friend_ of Cookworthy’s. Whether this were so or not is matter of little consequence, but it is due to Cookworthy, who was strictly conscientious and scrupulously honest and straightforward in all his transactions, to say that he has left it on record that he himself made the discovery, as will be seen by the following highly interesting paper written by him, but unfortunately without date:-- “It is now near twenty years since I discovered that the ingredients used by the Chinese in the composition of their porcelain, were to be got, in immense quantities, in the county of Cornwall; and as I have since that time, by abundance of experiments, clearly proved this to the entire satisfaction of many ingenious men, I was willing this discovery might be preserved to posterity, if I should not live to carry it into a manufacture; and, with this view, I have thought proper to put in writing, in a summary way, all I have discovered about this matter.