Great comment, and yes, she published her sonata some 10 years after these Etudes (at least according to Imslp) and apparently used the Etude as the last movement of the Sonata Opus 21. Reusing and recycling works was fairly common practice, Bach, for example, did that many times.
![Chaminade - 6 Études de concert, Op. 35 (Audio+Sheet) [Viner]](http://i.ytimg.com/vi/cKvhuv29yLs/mqdefault.jpg)
![Chaminade - 6 Études de concert, Op. 35 (Audio+Sheet) [Viner]](/img/tr.png)
This is the third part of her sonata
Great comment, and yes, she published her sonata some 10 years after these Etudes (at least according to Imslp) and apparently used the Etude as the last movement of the Sonata Opus 21. Reusing and recycling works was fairly common practice, Bach, for example, did that many times.