"Wonder we can stop on the rails," said Mannering. "This is a fifty-knot gale, or I'm mistaken."

"I'm thinking of the Chadlands trees," answered the other. "It's rum how, in the middle of such an awful business as this, the mind switches off to trifles. Does it on purpose, I suppose, to relieve the strain. Yes, the trees will catch it to-night. I expect I shall hear a grim tale of fallen timber from Sir Walter by the time I get back to-morrow."

"If nothing's fallen but timber, I sha'n't mind," answered Mannering; "but you've made me devilish uneasy now. If anything further went wrong—well, to put it mildly, they would say your uncle ought to have known a great deal better."

"He does know a great deal better. It's only that temporarily he's knocked off his balance. But I hardly feel as anxious as you do. There's Mary against May; and even if my uncle were for him, on a general, vague theory of something esoteric and outside nature, which you can't fairly call unreasonable any more, Mannering, seeing what's happened—even if Sir Walter felt tempted to let him have his way, I don't believe he'd really consent when it came to the point."

"I hope not—I hope not," answered the other. "Such a concession would take a lot of explanation if the result were another of these disasters. There ought to be an official guard over the room."

"After to-morrow there certainly will be," replied Henry. "You may be sure the police won't leave it again till they've satisfied themselves. All the same, I don't see how a dozen of them will be any safer than one—even if it's some material and physical thing that happens, as we must suppose. And for that matter, if it's really supernatural, why should a dozen be safer than one? Obviously they wouldn't. Whatever it is, it can strike as it likes and without being struck back."

But Dr. Mannering did not answer these questions. He was considering a little book in his pocket, which he would hand over to the police in London next morning.

"Poor chap—if he could have begun by taking the problem by the throat, as he has written here. But, instead, it took him by the throat!"

He took Hardcastle's notebook from his pocket and read again the last few pages.

"He was dreaming of his theories to the last, when he should surely have been girt up in every limb to face facts," said Lennox. "He never realized the horrible danger."