The last glow in the sky tinted the calm sheet of water a deep blood colour. Sarakoff opened his bag and took out a couple of tubes.

He pulled the cotton-wool plugs out of the tubes, and with a long wire, loosened the gelatinous contents. Then, inverting the tubes he flung them into the lake close to the beginning of the huge aqueduct.

I stared as the tubes vanished from sight, feeling that it was too late to regret what had now been done, for nothing could collect those millions of bacilli, that had been set free in the water. Already some of them had perhaps entered the dark cavernous mouth of the first culvert to start on their slow journey to Birmingham. The light faded from the sky and darkness spread swiftly over the lake. Sarakoff emptied the remaining tubes calmly and then turned his footsteps in the direction of Rhayader. I waited a moment longer in the deep silence of that lonely spot; and then with a shiver followed my friend. The bacillus had been let loose on the world.

CHAPTER VI

THE ATTITUDE OF MR. THORNDUCK

We reached London next day in the afternoon. I felt exhausted and could scarcely answer Sarakoff, who had talked continuously during the journey.

But his theory had interested me. The Russian had revealed much of his character, under the stress of excitement. He spoke of the coming of Immortality in the light of a physical boon to mankind. He seemed to see in his mind's eye a great picture of comfort and physical enjoyment and of a humanity released from the grim spectres of disease and death, and ceaselessly pursuing pleasure.

"I love life," he remarked. "I love fame and success. I love comfort, ease, laughter, and companionship. The whole of Nature is beautiful to me, and a beautiful woman is Nature's best reward. Now that the dawn of Immortality is at hand, Harden, we must set about reorganizing the world so that it may yield the maximum of pleasure."

"But surely there will be some limit to pleasure?" I objected.