“Good night,” said Cornish. And he was left alone for the first time in his life with Von Holzen, who was clearing the table and making his preparations with a silent deftness of touch acquired by the handling of delicate instruments, the mixing of dangerous drugs.

“Then our good friend Lord Ferriby does not know that you are here?” he inquired, without much interest, as if acknowledging the necessity of conversation of some sort.

“No,” answered Cornish.

“When I have shown you this experiment,” pursued Von Holzen, setting the lamp on a side-table, “we must have a little talk about his lordship. With all modesty, you and I have the clearest heads of all concerned in this invention.” He looked at Cornish with his sudden, pleasant smile. “You will excuse me,” he said, “if while I am doing this I do not talk much. It is a difficult thing to keep in one's head, and all the attention is required in order to avoid a mistake or a mishap.”

He had already assumed an air of unconscious command, which was probably habitual with him, as if there were no question between them as to who was the stronger man. Cornish sat, pleasantly silent and acquiescent, but he felt in no way dominated. It is one thing to assume authority, and another to possess it.

“I have a little laboratory in the factory where I usually work, but not at night. We do not allow lights in there. Excuse me, I will fetch my crucible and lamp.”

And he went out, leaving Cornish alone. There was only one door to the room, leading straight out into the open. The office, it appeared, was built in the form of an annex to one of the storehouses, which stood detached from all other buildings.

In a few minutes Von Holzen returned, laden with bottles and jars. One large wicker-covered bottle with a screw top he set carefully on the table.

“I had to find them in the dark,” he explained absent-mindedly, as if his thoughts were all absorbed by the work in hand. “And one must be careful not to jar or break any of these. Please do not touch them in my absence.” As he spoke, he again examined the stoppers to see that all was secure. “I come again,” he said, making sure that the large basket-covered bottle was safe. Then he walked quickly out of the room and closed the door behind him.

Almost immediately Cornish was conscious of a bitter taste in his mouth, though he could smell nothing. The lamp suddenly burnt blue and instantly went out.