1. THE DIVERSITY OF WORLDSThe planet on which we now descended after our long flight among the stars was the first of many to be visited. In some we stayed, according to the local calendar, only a few weeks, in others several years, housed together in the mind of some native. Often when the time came for our departure our host would accompany us for subsequent adventures. As we passed from world to world, as experience was piled upon experience like geological strata, it seemed that this strange tour of worlds was lasting for many lifetimes. Yet thoughts of our own home-planets were constantly with us. Indeed, in my case it was not till I found myself thus exiled that I came to realize fully the little jewel of personal union that I had left behind. I had to comprehend each world as best I
