 Walpole 's debt to Henry James is discernible in The Duchess of <unk> ( 1914 ) and The Green Mirror ( 1917 ) , but in the view of J B Priestley the two most potent influences on Walpole were the highly contrasting ones of Trollope and <unk> . Other critics noted the <unk> influence ; in 1923 Arthur St John <unk> commented : 
