I teach at a graduate school that is structured around the concept of writing and design, type and image, and I found this book very useful for in class and homework assignments.
Each student had their own copy and I asked each of them to pick a word from the book as well as one of the corresponding definitions, and describe it typographically - using type as image to convey the meaning. It proved to be a great exercise to teach students the basic principles of scale, contrast, unity, perspective, etc. and actually have them retain it! Even the weaker students suprised me and themselves with how effective thier solutions were. It motivated most of the students to use the principles in their more complex design projects. Plus it's small, it's durable and it's beggs to be written in - making your own notations along the way.
I'm pleased visual examples were omitted by the author. It allows the reader to make his/her own interpretations of the word. The definition is there to keep us in check.