For, having satisfied himself that Frank Cheeryble could have no knowledge of, or acquaintance with, the mysterious young lady, it began to occur to him that even he himself might never see her again; upon which hypothesis he built up a very ingenious succession of tormenting ideas which answered his purpose even better than the vision of Mr Frank Cheeryble, and tantalised and worried him, waking and sleeping.
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He hypothesized the existence of Pluto before its discovery.
The hypothetical situation made it easier for him to think about his problem more logically and less emotionally.