Robert W. Lowndes

“ He looked at her a moment, then shrugged, came over to the sofa, and sat beside her. "There must have been some, Eric," she said.
"The law of averages would seem to indicate that. There might be some who are naturally immune to whatever brand of poison this is; some who escaped as did we; some who were underground, or in forests. But until we learn differently, we must assume that we are the only humans alive."
His eyes were haunted. "How could we have missed it?" he whispered. "We checked and re-checked all the data, and put it to the calculating machines. ”

“ She was silent for a moment, then she slipped off her gloves, laid a hand on his arm. "Eric," she whispered. "I'm sorry it had to happen at a time like this. It may be that Sandra escaped, too. I know what she means to you. If we find her, later, I shan't stand in the way."
He chewed his lips. "That's all over, now. The first thing we must do is to check up on the food, water, and sanitation system. Just how long the machines will run without human supervision is questionable—not long, at any rate. The robots cannot do everything alone, either." ”

“ Wasn't he the one who claimed to have discovered a sort of gaseous cloud in space? Our system was supposed to be approaching it; when it reached our atmosphere, it would prove a deadly poison to all life-forms on this planet. ”