"Then go at once to Yvette in St. Julien," I said. "Ask her to harness the dog-cart and drive you to the convent in Quimperlé. Wait for me there. Will you do this without questioning me, my darling?"
She raised her face to mine. "Kiss me," she said innocently; the next moment she had vanished.
I walked deliberately into the Purple Emperor's room and peered into the gauze-covered box which had held the chrysalis of Apatura Iris. It was as I expected. The chrysalis was empty and transparent, and a great crack ran down the middle of its back, but, on the netting inside the box, a magnificent butterfly slowly waved its burnished purple wings; for the chrysalis had given up its silent tenant, the butterfly symbol of immortality. Then a great fear fell upon me. I know now that it was the fear of the Black Priest, but neither then nor for years after did I know that the Black Priest had ever lived on earth. As I bent over the box I heard a confused murmur outside the house which ended in a furious shout of "Parricide!" and I heard the gendarmes ride away behind a wagon which rattled sharply on the flinty highway. I went to the window. In the wagon sat Yves Terrec, bound and wild-eyed, two gendarmes at either side of him, and all around the wagon rode mounted gendarmes whose bared sabres scarcely kept the crowd away.
"Parricide!" they howled. "Let him die!"
I stepped back and opened the gauze-covered box. Very gently but firmly I took the splendid butterfly by its closed fore wings and lifted it unharmed between my thumb and forefinger. Then, holding it concealed behind my back, I went down into the café.
Of all the crowd that had filled it, shouting for the death of Yves Terrec, only three persons remained seated in front of the huge empty fireplace. They were the Brigadier Durand, Max Fortin, the chemist of Quimperlé, and the Purple Emperor. The latter looked abashed when I entered, but I paid no attention to him and walked straight to the chemist.
"Monsieur Fortin," I said, "do you know much about hydrocarbons?"
"They are my specialty," he said astonished.
"Have you ever heard of such a thing as cythyl?"
"Schweineri's cythyl? Oh, yes! We use it in perfumery."