It may be worth recording that in the course of the play, the great John Kemble was required to execute, not exactly what is now known as a "sensation header," but still a gymnastic feat of some difficulty and danger. Earl Percy has something of the agility of a harlequin about him, and when he obtains admission into his enemy's castle to rescue Angela, he is required to climb from a sofa up to a gothic window high above him, and then, alarmed by the approach of his negro sentinels, to fall from the height flat again at full length upon his sofa, and to pretend to be asleep as his guards had previously left him. Kemble is said to have done this "as boldly and suddenly as if he had been shot." When people complimented him upon his unsuspected agility, he would answer: "Nay, gentlemen, Mr. Boaden has exceeded all compliment upon this feat of mine, for he counselled me from Macbeth to 'jump the life to come.'" "It was melancholy," comments Mr. Boaden, recording the success of the play, "to see the abuse of such talents;" and then he adds the remarkable opinion: "It is only in a barn that the Cato of a company should be allowed to risk his neck!" Against "The Castle Spectre" the critics, of course, raised their voices. Its popularity was viewed with much bitterness and jealousy. "The great run the piece had," writes the reverend author of "The History of the Stage," "is a striking proof that success is a very uncertain criterion of merit. The plot is rendered contemptible by the introduction of the ghost." "I hope it will not be hereafter believed," cried Cooke the actor, "that 'The Castle Spectre' could attract crowded houses when the most sublime productions of the immortal Shakespeare could be played to empty benches." A dispute arising in the green-room of the theatre between Lewis and Sheridan, Lewis offered to bet all the money which the play had brought that he was in the right. "No," said Sheridan, "I can't afford to bet so much as that; but I'll tell you what I'll do. I'll bet you all it's worth." Still, there was no cavilling down the play. The stage ghost was triumphant. He had attained his apogee. "The Castle Spectre" remained a stock piece for years, and has even appeared upon the stage in quite recent times.