Finding a clean, complete, and legible copy of the in Spanish is a challenge. The book has been out of print for decades. The PDFs circulating online are often scans of university library copies, frequently missing pages or suffering from faded ink.
Consequently, has become a specific request on music theory forums (like Reddit’s r/musictheory or the scoreclub community). It is the "holy grail" page that users desperately need to complete their understanding of the fugal exposition.
The rigorous training described in the book is exactly what shaped Ravel’s impeccable craftsmanship. When you listen to the intricate textures of Le Tombeau de Couperin or the String Quartet , you are hearing the principles found in Gedalge’s text applied with genius.
The book is structured methodically. It begins with the fundamentals of the subject, moves to the answer (réponse), and covers the exposition, development, and stretto. However, unlike other treatises that might list rules without explanation, Gedalge explains the logic behind the voice leading.