eight o'clock
cried Helen joyously . `` Then you 've concluded I 'm right , after all ? '' `` No , '' said Darrow ; `` but if this thing carries out to its logical conclusion , I 'm going to need a good bull-terrier pup ! '' The next morning promptly at eight o'clock Jack Warford , in response to a muttered invitation , burst excitedly into Percy Darrow 's room . He found the scientist , draped in a pale-pink silk kimono embroidered with light-blue butterflies , scraping methodically at his face with a safety-razor . At the sight the young fellow came to an abrupt stop , as though some one had met him with a dash of cold water in the face . `` Hello ! ''