"He did, Mr. Narkom, only that he didn't recognize it. Woorali is extremely volatile, for one thing, and evaporates rapidly. For another, there was a very small quantity used--a very small quantity necessary, so malignant it is--and the water furnished by the melting icicle could dilute that little tremendously. It would not be able to obliterate all trace of it, however, but the infinitesimal portion remaining would make spring water give the same answer in analysis as that given by the water resulting from melted snow. It was when Doctor Hague mentioned the fact that if it wasn't for the utter absurdity of looking for such a substance in England in July, he should have said it _was_ melted snow, that I really got my first clue. Later, however, when----But come, let's chuck it! I've had enough of murder and murderers for one day--let's talk of something else. Our new 'turnout,' here, for instance. You have 'done yourself proud' this time and no mistake--she certainly _is_ a beauty, Mr. Narkom. By the way, what have you done with the old red one? Sold it?" "Not I, indeed. I know a trick worth two of that. I send it out, empty, every day, in the hope of having those Apache johnnies follow it, and have a plain-clothes man trailing along behind in a taxi, ready to nip in and follow them if they do. But they don't--that is, they haven't up to the present; but there's always hope, you know." "Not in that direction, I'm afraid. Waldemar's a better general than that, believe me. Knowing that we have discovered his little plan of following the red limousine just as we discovered his other, of following me, he will have gone off on another tack, believe me." "Scotland! You don't think, do you, that he can possibly have found out anything about the new one and has set in to follow _this_?" "No, I do not. As a matter of fact I fancy he has started to do what he ought to have done in the beginning--that is, to keep a close watch on the criminal news in the papers day by day, and every time a crime of any importance crops up, pay his respects to the theatre of it and find out who is the detective handling the case. A ducat to a doughnut he'd have been on our heels down here to-day if this little business of the Stone Drum had been made public in time to get into the morning papers. He means to have me, Mr. Narkom, if having me is possible; and he's down to the last ditch and getting desperate. Yesterday's cables from Mauravania are anything but reassuring." "I know. They say that unless something happens very shortly to turn the tide in Ulric's favour and quell the cries for 'Restoration,' the King's downfall and expulsion are merely a matter of a few days at most. But what's that got to do with it that you suggest its bearing upon any need for haste on Waldemar's part?"