The Black Sailor followed his example, and so the two sat in silence, waiting, waiting. The atmosphere of the room grew thick and heavy, difficult to breathe. The Professor found his thoughts floating away to trifling things, he imagined himself a boy again, at school⁠—With a mighty effort of will he recalled them, forcing his mind to concentrate upon the thing he had to do. Yet, was it worth it? Death, in that comfortable chair, would be so easy. A pleasant languor crept over him. He had only to close his eyes and sleep⁠—

Again his will triumphed. He must wait a few seconds longer, wait till the whole room was full of gas. But could he, dare he? His senses were slipping away fast. Yet he must retain consciousness, if only for those few seconds. The Black Sailor was glaring at him with baleful eyes, eyes that suddenly seemed familiar, as though they stared out at him from the past, many, many years ago. Where had he seen those eyes before?