I have found myself wanting to throw this book out my window on several occasions because the examples are so inaccessible for most of the book, and the chapter on observing language change is laughable, at best. If you're taking a Historical Linguistics class, pray your instructor is using a different book, or do yourself a favor and buy Lyle Campbell's book as a supplement; it's much more clear, and the examples are not derived from a bunch of Polynesian languages. It helps if you have some familiarity with the languages used to illustrate the change or theory at hand, and this text falls very much short of that, which seems like a pedagogical misstep.