“For the gambling. That’s hardly travelling. Now, I’ve studied this subject a little, quietly in Harley Street. I’m no traveller myself, but I have dozens of patients who are. And I’m convinced that the modern facilities for travel, besides giving an infinity of pleasure, bring about innumerable tragedies.”

He turned to me.

“You go abroad a great deal. What do you say?”

“That you’re perfectly right. And I’m prepared to affirm that, in highly-strung, imaginative, or over-worked people change of climate does sometimes actually cause, or seem to cause, change of nature.”

Young England, who was by no means highly-strung or imaginative, looked politely dubious, but the doctor was evidently pleased.

“An ally!” he cried.

He glanced at me for an instant, then added:

“You’ve got a case that proves it, at any rate to you, in your mind.”

“Quite true.”

“Can you give it us?”