"Traité de La Gravure a l'eau forte" is a didactic work by French printmaker and theorist Maxime Lalanne that combines instructional text with practical examples of etching technique. The book contains four etchings by Lalanne himself, which serve as illustrations of the principles and methods discussed in the treatise. Published in the 19th century, this work was an influential manual for artists seeking to master the technical and artistic aspects of etching.