Theory and Practice of Design: An Advanced Textbook on Decorative Art by Frank G. Jackson, 1896
I only came to know of this book when someone brought it up to buy in the shop! Too bad, I would’ve loved to have this in my collection. It was published on the cusp of the rise of Art Nouveau movement, which is very evident in the illustrations. However, a lot of them still cling to classical influence- it makes an interesting dichotomy.
I especially like the page on the incorporation of root vegetables as design elements, as well as the winged dog.