6: Historical Linguistics: An Introduction, Winfred P. Lehmann

Pretty interesting. It finds itself in a funny place between pop science and technical linguistics: some of the explanations are long and not easy to follow without linguistic background, and some are oddly elementary. Wouldn't anyone with the required training to read the IPA already know things like the current thinking on the origin of the alphabet?

If anything, this drove home the point that I ought to learn to read IPA.