Ben Hecht is mountebank of words par excellence: their swirling shapes, their sounds, their shifting colors, as he juggles them so adroitly before our bewildered eyes. The subject-matter of his books serves only as a pattern, an excuse for weaving a tapestry of fascinating and often amazing phrases. Whether it is a psychological study in the manner of Dreiser, like Gargoyles, or an all-night detective story, like the present book, is an altogether incidental matter. It is the words that count. That may perhaps explain why Mr. Hecht should suddenly decide to perform before such a bourgeois audience, descending, so to speak, from the Palace to the four-a-day. He evidently realized that the world was quite bored by anything he had to say, but perfectly entranced by the way in which he said it. _The Florentine Dagger_ was written with Prof. Hart’s Psychology of Insanity on one hand and the Memoirs of the de Medici Family on the other. Taken as a dramatic presentation of certain psychological phenomena it is brilliant enough to make itself endeared by every psychology professor in the country. Everyone in the book, from the last member of the fastidious de Medicis to the old actress, is troubled by complexes and obsessions of all sorts, so that a miserable and uncertain rôle is assigned to each. All the time-dishonored devices of the mystery story are faithfully observed, although its technique on the whole is genuinely successful. Mr. Hecht has in this book, as in all his others, displayed his incredible faculty for choosing a new literary technique as casually as most writers choose their stationery. W. T. _The Blind Bow Boy._ By CARL VAN VECHTEN. (Alfred Knopf.) Carl Van Vechten is an elegant dilettante. His books are the essence of trivial and charming existence. He is fond of cats, George Moore, Rolls Royce motor cars, and cravats by Charvet. He is apathetic to Corot and Monet, to Ibsenism, midwestern mediocrity, and synthetic gin. _The Blind Bow Boy_ is of inferior quality to _Peter Whiffle_, just as _Peter Whiffle_ is undoubtedly inferior to _Memoirs of My Dead Life_, but it is good reading and by far the most intelligent intellectual mixed grill of which the reviewer has partaken this season. The fact that Van Vechten is in the good graces of the greatest of all American whim-whammers, Henry Mencken, is in itself a warrant for the six editions into which the book has already run. It may also prevent it from running into another six.