"Well, never mind trying; I'll just tell you about it." Hanlon
laughed good-naturedly at the frantic attempts of all of them to
open their eyes in accordance with his directions.

"Anyhow, you gentleman know, for I know you all belong to a big
athletic club, that if you exercise any set of muscles regularly
and for a long time, they will develop and expand and become
greatly increased in size and strength."

"Sure," said Hendricks. "I once developed my biceps--"

"Yes, that's what I mean. Well, sir, I worked at my forehead
muscles some hours a day for months and I kept at it until I had
those muscles not only developed and in fine working condition
but absolutely under my control. Look!"

They gazed, fascinated, while the strange visitor moved the skin
of his forehead up and down and sideways, and in strange circular
movements. He seemed distinctly proud of his accomplishment and
paused for approbation.

"Marvelous, Holmes, marvelous!" exclaimed Hendricks, who had
discovered that Hanlon did not resent jocularity, "but--what
for?"

"Can't you guess?" and the young man smiled mysteriously. "Try."

"Give it up," and Hendricks shook his head. "I think it's more
wonderful to get thought-transference by wiggling your forehead