"I'll see that he sleeps sound enough not to interfere with us to-morrow night," said Lewis Flagg. "Leave that to me."

He spoke confidently; but to all the questions of the other boys as to how he was to bring about this result, he turned a deaf ear.

But he succeeded in bringing every one of his five schoolmates to his own way of thinking, or, at least, to agreeing to join in the proposed expedition; and his arrangements were carried on without any further demur openly expressed from them.

Seabrooke was in the habit of taking a generous drink of water every night the last thing before he retired. On the evening of the following day, and that for which the aforesaid frolic had been planned, Lewis Flagg might have been found in the dormitory at a very unusual hour; and had there been any one there to see, he might have been observed to shake the contents of a little paper, a fine white powder, into the water carafe which stood filled upon the wash-stand in Seabrooke's alcove. Then, with the self-satisfied air of one who has accomplished a great feat, he stole from the room and back to his schoolmates.

"Seems to me Seabrooke has been uncommonly chirk and chipper this evening," said Charlie Denham, when the boys had gone to their rooms, as their masters supposed-for the night.

"Yes, he had a letter by the evening mail which seemed to set him up wonderfully," said Raymond. "I hope it has eased his mind of whatever was on it so that he won't be wakeful to-night."

"Oh, he'll sleep sound enough, I'll warrant you," said Lewis Flagg, with a meaning laugh.

Ensconced in bed, every boy fully dressed, but with other clothes so arranged as to deceive an unsuspecting observer into the belief that all was as usual, they waited the time when Seabrooke should be asleep.

The young tutor's alcove was not within the range of Lewis' vision, but Percy from his bed could see all that went on there, and he lay watching Seabrooke. As usual, at the last moment the latter poured out a glass of water and proceeded to drink it down; but he had not taken half of it when he paused, and Percy saw him hold it up to the light, smell it, taste of it again and then set the glass down, still more than two-thirds full.

Harley Seabrooke had no mental cause for restlessness that night; the evening mail had, as Raymond said, brought him that which had lifted a load of suspense and anxiety from his mind, and he was unusually light-hearted and at ease. His head was scarcely upon his pillow when he was asleep, but not so very sound asleep, for Flagg had over-shot his mark, and the sleeping potion which he had so wickedly put into the carafe of water had given it a slightly bitter taste, so that Seabrooke had found it disagreeable and had not drank the usual quantity, and the close he had taken was not sufficient to stupefy him, but rather to render him wakeful as soon as it began to act.