Under a mantle of beauty there may be hidden something desperately evil, while a revolting mask sometimes covers a gem of pure loveliness. The difficulty of touching upon the hideous aspects of life lies in the fact that different social classes are so cut off from one another as to be quite ignorant of each other. Each has its virtues, covering the vices due to its own conventions of life; and to each the vice it does not know appears more intolerable and more unnatural than the vice it is acquainted with.