Letters and postcards were written from various places : Paris, Royan, Villefranche-sur-Mer, Cannes, Brussels, Fontainebleau, Salzburg and elsewhere. It is a characteristically witty series, especially in the collection of postcards, where the composer often sends a humorous line or remark, sometimes relating to the image printed on the reverse, enclosing frivolous and irreverent poems. It is also a revealing correspondence, all the more since Paul Dukas was a notably private person. This collection of letters to Marguerite Hasselmans contains intimate insights into his private and professional life, discussing his works, including Ariane et Barbe-Bleu, the symphony, la Peri amongst others ; his friendship with Albéniz (deploring his loss), Fauré, Paul Claudel, Alfred Cortot, Widor, Saint-Saëns, Jacques Durand, Florent Schmitt, Poujaud, and his family, including announcing his decision to marry Suzanne Pereyra, the death of his brother, the anniversary of his father's death and other family events; the musical life of Paris and his work as a critic. As the companion of Fauré and a musician herself, Marguerite Hasselmans was a uniquely-placed correspondent for Paul Dukas.Their correspondence continued and even intensified after Fauré's death.