"It's when attacked, or even frightened, as with a camera flashlight, that the ectoplasm vanishes or is reabsorbed?" he prompted further.
"So Richet says here," I agreed once more, "and so I have found."
"Very good. Now," and his manner took on a flavor of the legal, "I shall sum up:
"Ectoplasm is put forth by certain spirit mediums, who are mysteriously adapted for it, under favorable conditions that include darkness, quiet, self-confidence. It takes form, altering the appearance of the medium or making up a separate body. It is firm and strong, but vanishes when attacked or frightened. Right so far, eh?"
"Right," I approved.
"Now, for the word medium substitute wizard." His grin burst out again, and he began to mix a third round of drinks. "A wizard, having darkness and quiet and being disposed to change shape, exudes a material that gives him a new shape and character. Maybe it is bestial, to match a fierce or desperate spirit within. There may be a shaggy pelt, a sharp muzzle, taloned paws and rending fangs. To a terrified victim he is doom itself. But to a brave adversary, facing and fighting him——"
He flipped his way through Summers' book, as I had with Richet's. "Listen: '... the shape of the werewolf will be removed if he be reproached by name as a werewolf, or if again he be thrice addressed by his Christian name, or struck three blows on the forehead with a knife, or that three drops of blood should be drawn.' Do you see the parallels, man? Shouted at, bravely denounced, or slightly wounded, his false beast-substance fades from him." He flung out his hands, as though appealing to a jury. "I marvel nobody ever thought of it before."
"But nothing so contrary to nature has a natural explanation," I objected, and very idiotic the phrase sounded in my own ears.
He laughed, and I could not blame him. "I'll confound you with another of your own recent experiences. What could seem more contrary to nature than the warmth and greenness of the inside of Devil's Croft? And what is more simply natural than the hot springs that make it possible?"
"Yet, an envelope of bestiality, beast-muzzle on human face, beast-paws on human hands——"