[12] In telling the story, in that collection, of how 'Nightfall' came to be written, I mentioned that I had received $150 for it, quoting from memory. Once again, I must confess fallibility. The records say $166. It is a small point, and perhaps not worth noting, but I know my readers. By explaining this now, I fend off dozens of letters that will mention the discrepancy and demand an explanation.