Thus I learnt the history of the horrible tank that had so nearly ended my own life, as I have already related. Clearly the Naylors had changed their name to Crofting on taking compulsory service with Dorrington, and Mrs. Naylor was the repulsively thin woman who had drugged me with her coffee in the house at Highgate. The events I have just recorded took place about three years before I came to England. In the meantime how many people, whose deaths might be turned to profit, had fallen victims to the murderous cunning of Dorrington and his tools? THE CASE OF THE "MIRROR OF PORTUGAL" III The Case of the "Mirror of Portugal" I Whether or not this case has an historical interest is a matter of conjecture. If it has none, then the title I have given it is a misnomer. But I think the conjecture that some historical interest attaches to it is by no means an empty one, and all that can be urged against it is the common though not always declared error that romance expired fifty years at least ago, and history with it. This makes it seem improbable that the answer to an unsolved riddle of a century since should be found to-day in an inquiry agent's dingy office in Bedford Street, Covent Garden. Whether or not it has so been found the reader may judge for himself, though the evidence stops far short of actual proof of the identity of the "Mirror of Portugal" with the stone wherewith this case was concerned. But first, as to the "Mirror of Portugal." This was a diamond of much and ancient fame. It was of Indian origin, and it had lain in the possession of the royal family of Portugal in the time of Portugal's ancient splendour. But three hundred years ago, after the extinction of the early line of succession, the diamond, with other jewels, fell into the possession of Don Antonio, one of the half-dozen pretenders who were then scrambling for the throne. Don Antonio, badly in want of money, deposited the stone in pledge with Queen Elizabeth of England, and never redeemed it. Thus it took its place as one of the English Crown jewels, and so remained till the overthrow and death of Charles the First. Queen Henrietta then carried it with her to France, and there, to obtain money to satisfy her creditors, she sold it to the great Cardinal Mazarin. He bequeathed it, at his death, to the French Crown, and among the Crown jewels of France it once more found a temporary abiding place. But once more it brought disaster with it in the shape of a revolution, and again a king lost his head at the executioner's hands. And in the riot and confusion of the great Revolution of 1792 the "Mirror of Portugal," with other jewels, vanished utterly. Where it went to, and who took it, nobody ever knew. The "Mirror of Portugal" disappeared as suddenly and effectually as though fused to vapour by electric combustion.