"Yours sincerely,
"Fradley & Toomer."
The inclosed slip read as follows:
"Messrs. Fradley & Toomer,
"Gentlemen: Cythaline, a complex hydrocarbon, was first used by Professor Schnoot, of Antwerp, a year ago. I discovered an analogous formula about the same time and named it cythyl. I have used it with great success everywhere. It is as certain as a magnet. I beg to present you three small jars, and would be pleased to have you forward two of them to your correspondent in St. Gildas with my compliments. Blowzer's quotation of me, on page 630 of his glorious work, How to catch British Butterflies, is correct.
"Yours, etc.,
"Heinrich Schweineri,
P.H.D., D.D., D.S., M.S."
When I had finished this letter I folded it up and put it into my pocket with the others. Then I opened Blowzer's valuable work, How to catch British Butterflies, and turned to page 630.
Now, although the Red Admiral could only have acquired the book very recently, and although all the other pages were perfectly clean, this particular page was thumbed black, and heavy pencil marks inclosed a paragraph at the bottom of the page. This is the paragraph:
"Professor Schweineri says: 'Of the two old methods used by collectors for the capture of the swift-winged, high-flying Apatura Iris, or Purple Emperor, the first, which was using a long-handled net, proved successful once in a thousand times; and the second, the placing of bait upon the ground, such as decayed meat, dead cats, rats, etc., was not only disagreeable, even for an enthusiastic collector, but also very uncertain. Once in five hundred times would the splendid butterfly leave the tops of his favourite oak trees to circle about the fetid bait offered. I have found cythyl a perfectly sure bait to draw this beautiful butterfly to the ground, where it can be easily captured. An ounce of cythyl placed in a yellow saucer under an oak tree, will draw to it every Apatura Iris within a radius of twenty miles. So, if any collector who possesses a little cythyl, even though it be in a sealed bottle in his pocket—if such a collector does not find a single Apatura Iris fluttering close about him within an hour, let him be satisfied that the Apatura Iris does not inhabit his country.'"
When I had finished reading this note I sat for a long while thinking hard. Then I examined the two jars. They were labelled "Cythyl." One was full, the other nearly full. "The rest must be on the corpse of the Red Admiral," I thought, "no matter if it is in a corked bottle——"
I took all the things back to the chest, laid them carefully on the straw, and closed the lid. The gendarme sentinel at the gate saluted me respectfully as I crossed over to the Groix Inn. The Inn was surrounded by an excited crowd, and the hallway was choked with gendarmes and peasants. On every side they greeted me cordially, announcing that the real murderer was caught; but I pushed by them without a word and ran upstairs to find Lys. She opened her door when I knocked and threw both arms about my neck. I took her to my breast and kissed her. After a moment I asked her if she would obey me no matter what I commanded, and she said she would, with a proud humility that touched me.