What could be more delightful than to have in the same few minutes all the fascinating terrors of going abroad combined with all the humane security of coming home again? What could be better than to have all the fun of discovering South Africa without the disgusting necessity of landing there? What could be more glorious than to brace one's self up to discover New South Wales and then realize, with a gush of happy tears, that it was really old South Wales. This at least seems to me the main problem for philosophers, and is in a manner the main problem of this book. How can we contrive to be at once astonished at the world and yet at home in it?