Midnight
`` Why should I ? '' she replied , with an arch look . `` If that personage will be equally forgetful of me I am sure I shall be very glad . '' `` Oh , I mean your horse -- Midnight , as you call him , '' laughed Hesden . `` So I supposed , '' she replied . `` I have a dim notion that you applied that eipthet to him on the night of my arrival . Your mother , too , said something about ` Satan , ' that night , which I remember puzzled me very greatly at the moment , but I was too much flustered to ask about it just then .