“Of course, of course,” cried the other, “you have my permission and my best wishes for success. I can see no possible objection, but⁠—”

“But what?”

“I pray to Heaven you will not undertake this experiment alone, will you?”

“Oh, dear, no; not alone.”

“You will take a companion with good nerves, and reliable in case of disaster, won’t you?”

“I shall bring two companions,” the doctor said.

“Ah, that’s better. I feel easier. I am sure you must have among your acquaintances men who⁠—”

“I shall not think of bringing men, Mr. Pender.”

The other looked up sharply.