"When Locke, as one of the executors of Boyle, was about to publish some of his works, Newton wished him to insert the second and third part of Boyle's recipes (the first part of which was to obtain 'a mercury that would grow hot with gold'), and which Boyle had communicated to him on condition that they should be published after his death."[15] "Mangetus relates a story of a stranger calling on Boyle, and leaving with him a powder, which he projected into the crucible, and instantly went out. After the fire had gone out, Boyle found in the crucible a yellow-coloured metal, possessing all the properties of pure gold, and only a little lighter than the weight of the materials originally put in the crucible."[16] From these proofs of the credulity of great men, let us turn to the encouragements vouchsafed to alchemy and its adepts by the Kings and Parliaments of England. Raymond Lully visited England on the invitation of Edward I.; and he affirms in one of his works, that in the secret chamber of St. Katherine, in the Tower of London, he performed in the royal presence the experiment of transmuting some crystal into a mass of diamond, or adamant, as he calls it; on which Edward, he says, caused some little pillars to be made for the tabernacle of God. It was popularly believed, indeed, at the time, that the English king had been furnished by Lully with a great quantity of gold for defraying the expense of an expedition which he intended to make to the Holy Land. Edward III. was not less credulous on this subject than his grandfather, as appears by an order which he issued in 1329, in the following terms:--"Know all men that we have been assured that John of Rous, and Master William of Dalby, know how to make silver by the art of alchemy; that they have made it in former times, and still continue to make it; and considering that these men, by their art, and by making the precious metal, may be profitable to us and to our kingdom, we have commanded our well-beloved Thomas Cary to apprehend the aforesaid John and William wherever they can be found, within liberties or without, and bring them to us, together with all the instruments of their art, under safe and sure custody." The first considerable coinage of gold in England was begun by Edward III. in 1343: and "The alchemists did affirm, as an unwritten verity, that the rose nobles, which were coined soon after, were made by projection or multiplication alchemical, by Raymond Lully, in the Tower of London." But Lully died in 1315; and the story only shows the strength of the popular faith in alchemy. That this pretended science was much cultivated in the fourteenth century, and with the usual evil results, may be inferred from an Act passed 5 Hen. IV. cap. 4 (1404), to make it felony "to multiply gold or silver, or to use the craft of multiplication," &c. It is probable, however, that this statute was enacted from some apprehension that the operations of the