The works of St. Catherine of Siena rank among the classics of the Italian language, written in the beautiful Tuscan vernacular of the fourteenth century. Notwithstanding the existence of many excellent manuscripts, the printed editions present the text in a frequently mutilated and most unsatisfactory condition. Her writings consist of •the "Dialogue", or "Treatise on Divine Providence"; •a collection of nearly four hundred letters; and •a series of "Prayers". The "Dialogue" especially, which treats of the whole spiritual life of man in the form of a series of colloquies between the Eternal Father and the human soul (represented by Catherine herself), is the mystical counterpart in prose of Dante's "Divina Commedia".