No man's memory is completely available at any given time. However it is recorded, however completely every bit of data may be recorded during a lifetime, much of it is unavailable because it is incompletely cross-indexed or, in some cases, labeled _Do Not Scan_. Or, metaphorically, the file drawer may be locked. It may be that, in many cases, if a given bit of data remains unscanned long enough it fades into illegibility, never reinforced by the scanning process. Sensory data, coming in from the outside world as it does, is probably permanent. But the thought patterns originating within the mind itself, the processes that correlate and cross-index and speculate on and hypothesize about the sensory data, those are much more fragile. A man might glance once through a Latin primer and have every page imprinted indelibly on his recording mechanism and still be unable to make sense of the _Nauta in cubito cum puella est_. Sometimes a man is aware of the holes in his memory. ("What was the name of that fellow I met at Eddie's party? Can't remember it for the life of me.") At other times, a memory may lay dormant and unremembered, leaving no apparent gap, until a tag of some kind brings it up. ("That girl with the long hair reminds me of Suzie Blugerhugle. My gosh! I haven't thought of her for years!") Both factors seemed to be operating in Bart Stanton's mind at this time. Incredibly, he had never, in the past year at least, had occasion to try to remember much about his past life. He had known who he was without thinking about it particularly, and the rest of his knowledge--language, history, politics, geography, and so on--had been readily available for the most part. Ask any educated man to give the product of the primes 2, 13, and 41, or ask him to give the date of the Norman Conquest, and he can give the answer without having to think of where he learned it or who taught it to him or when he got the information. But now the picture and the name in the paper had brought forth a reaction in Stanton's mind, and he was trying desperately to bring the information out of oblivion. Did he have a mother? Surely--but could he remember her? _Yes!_ Certainly. A pretty, gentle, rather sad woman. He could remember when she had died, although he couldn't remember ever having attended the funeral. What about his father? He could find no memory of his father, and, at first, that bothered him. He could remember his mother--could almost see her moving around in the apartment where they had lived ... in ... in ... in Denver! Sure! And he could remember the building itself, and the block, and even Mrs. Frobisher, who lived upstairs! And the school! A great many memories came crowding back, but there was no trace of his father. And yet.... Oh, of _course_! His father had been killed in an accident when Martinbart were very young. _Martinbart!_ [Illustration]