"But I haven't got it," Swift said passionately. "I haven't got a tenth part of it. Mr. Rent will be here to-morrow and you had better see him for yourself. I am sick of all this business. I begin to wish I had never come here at all. And now the sooner you clear out the better."

"I'm going when I like," Bark said sullenly. "And, mind you, I won't be played with any more. I can say too much and I can prove too much to be treated as if I were some tramp trying to beg a copper or two. If you take my advice you will leave Arnold Rent to his own resources. No man ever yet trusted him without repenting it afterwards. Poor as I am, I wouldn't be under a favour to that man unless I was obliged to, and it is possible that I may not have to come here to-morrow, after all. I have a scheme on, and if it turns out trumps you can tell your employer that he isn't likely to see me for a bit. What are you up to here? What's the little game?"

"We came here on a purely scientific errand," Swift said coldly. "And, in any case, our experiments will not be of the least interest to you. And now, as I am busy——"

"Oh, I'm off," Bark laughed. "I don't want to pry into your secrets; I've plenty of my own to worry about. Good-night."

Bark turned away and swaggered down the passage, so close that Grey could have touched him as he passed. He emerged into the road and went off towards the town with the air of a man who has much to do before he seeks his bed. Grey followed him at a respectful distance until he came to the lodge gate leading to the house recently occupied by John Charlock. Bark pushed through the gate and made his way along the grass towards the lawn at the back of the house. Here he stopped and produced a box of matches from his pocket. There was little or no wind, so that the match flamed out clearly, so clearly that the watcher could see Bark's evil face carefully examining a piece of paper which he had in his hand. So still was it that Grey could hear Bark's muttered comments.

"Hang me if I can make it out. What an awful fist she wrote, to be sure. Now, is it on this side or the other? And what does she mean by a hundred and fifty to the right? And where the dickens is the right supposed to begin? I wish I had a tape measure. Not that it would be much use on a dark night like this. Still, it won't do to work with a lantern."

The match went out and Bark's musings came to an end. Grey had been gazing so steadfastly at the match that when it was extinguished suddenly he could not see anything for the moment. Then, when his eyes became accustomed again to the gloom, he found that Bark had vanished, leaving not the slightest trace behind.

The incident was annoying as it was unexpected. There were trees all about the lawn standing back in dense shadow, so that it was almost impossible to make out in which direction Bark had gone. Grey could do nothing but go back to the road and wait till Bark came back again. There was, of course, a chance that his time might be wasted. But he had gone so far now that he did not care to abandon his search. He went slowly and cautiously back to the road and stood by the lodge gate for the best part of an hour. He was thinking of giving up the adventure when Bark came down the avenue muttering to himself and groaning as if he were in considerable pain. He did not appear to think it extraordinary that Grey should be there. On the contrary, he grinned knowingly and inquired affectionately after Tanza's welfare.

"You are wasting your time to-night, anyway," he said. "So am I, for the matter of that. There is something wrong with this place. Never mind why I am here. I stumbled over a fountain arrangement in the garden and fell with one hand in the water. It was only for a second, and now look at my fingers. Painful! Well, rather. But what the devil is it? Strike a match and look for yourself."

Bark held up a shaking hand in the light of the match. His fingers were shrivelled and blue, as if they had been badly scalded. There were blisters here and there, and Bark writhed with the pain he made no effort to conceal.