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Rh It is almost as light as aluminium. A gas mask does not arrest the poison; indeed, it evidently enters a body through the nearest point offered to it and a safe shield has not yet been discovered.

"I shall tell you more when we know more," concluded Sir Walter. "But at present it looks as though your prophecy were correct, and that science is not going to get at the bottom of the horrible secret easily. Dr. Mannering says that the properties of the elements have yet to be fully determined, while the subject of alloys was never suspected of containing such secrets as may prove to be the case. If more there is to learn, you shall learn it."

In his reply, Signor Mannetti declared that the Borgia bed continued to be a source of extreme satisfaction and comfort to him.

"As yet no vision has broken my slumbers, but I continue to hope that the Oriental features of Sultan Bajazet's brother may presently revisit the place of his taking off, and that Prince Djem will some night afford me the pleasure of a conversation. How much might we tell each other that neither of us knows!

"As to the wire, my friend, I will explain to you how that was probably created and, right or wrong, there is nobody on this earth at present who can prove my theory to be mistaken. Be sure that a mediæval alchemist, searching in vain for elixir vitæ, or the philosopher's stone, chanced upon this infernal synthesis and fusion. For him, no doubt, it proved a philosopher's stone in earnest, for the Borgia always extended a generous