The world that Sirius now lived in was bewilderingly different from both his two other worlds, North Wales and Cambridge. The three worlds were inhabited by such diverse creatures that he could almost believe them three different species. Country people, intellectuals, dockers! Mentally they were far more alien to one another than dogs, cats and horses. Yet, of course, the difference was really all imposed by environment. Well, for the present he was wholly occupied in studying his third world; the others faded imperceptibly into dreamlands. For some weeks he was far too interested in the East End to look back on those other worlds; but at last there came times, chiefly when Geoffrey was busy on committee work, when he found himself hankering after open country and the smell of the sheep.
