“As all spectres are traditionally supposed to do!” said Dr. Brayle, lighting a cigarette as he spoke and beginning to smoke it with a careless air—­“I vote for catching the ghost before it melts away into the morning.”

While this talk went on Mr. Harland stepped back into the saloon and wrote a note which he enclosed in a sealed envelope.  With this in his hand he came out to us again.

“Captain, will you get the boat lowered, please?” he said—­then, as Captain Derrick hastened to obey this order, he turned to his secretary:—­“Mr. Swinton, I want you to take this note to the owner of that yacht, whoever he may be, with my compliments.  Don’t give it to anyone else but himself.”

Mr. Swinton, looking very pale and uncomfortable, took the note gingerly between his fingers.

“Himself—­yes!”—­he stammered—­“And—­er—­if there should be no one—­ "

“What do you mean?” and Mr. Harland frowned in his own particularly unpleasant way—­“There’s sure to be someone, even if he were the devil!  You can say to him that the ladies of our party are very much interested in the beautiful illumination of his yacht, and that we’ll be glad to see him on board ours, if he cares to come.  Be as polite as you can, and as agreeable as you like.”

“It has not occurred to you—­I suppose you have not thought—­that—­ that it may be an illusion?” faltered Mr. Swinton, uneasily, glancing at the glistening sails that shamed the silver sheen of the moon—­“A sort of mirage in the atmosphere—­”

Mr. Harland gave vent to a laugh—­the heartiest I had ever heard from him.

“Upon my word, Swinton!” he exclaimed—­“I should never have thought you capable of nerves!  Come, come!—­be off with you!  The boat is lowered—­all’s ready!”

Thus commanded, there was nothing for the reluctant Mr. Swinton but to obey, and I could not help smiling at his evident discomfiture.  All his precise and matter-of-fact self-satisfaction was gone in a moment,—­he was nothing but a very timorous creature, afraid to examine into what he could not at once understand.  No such terrors, however, were displayed by the sailors who undertook to row him over to the yacht.  They, as well as their captain, were anxious to discover the mystery, if mystery there was,—­and we all, by one instinct, pressed to the gangway as he descended the companion ladder and entered the boat, which glided away immediately with a low and rhythmical plash of oars.  We could watch it as it drew nearer and nearer the illuminated vessel, and our excitement grew more and more intense.  For once Mr. Harland and his daughter had forgotten all about themselves,—­and Catherine’s customary miserable expression of face had altogether disappeared in the keenness of her interest for something more immediately thrilling than her own ailments.  So far as I was concerned, I could hardly endure the suspense that seemed to weigh on every nerve of my body during the few minutes’ interval that elapsed between the departure of the boat and its drawing up alongside the strange yacht.  My thoughts were all in a whirl,—­I felt as if something unprecedented and almost terrifying was about to happen,—­but I could not reason out the cause of my mental agitation.