A really good book! Very well written and containing a lot of valuable information about the fascinating world of brewing yeast. The author has also included how to perform both simple tests as well as very complex ones using specific lab equipment. It is also worth noting the section about how to set up your own lab.
However, the only downside is that the writer, being the owner of White Labs (one of the world's principal producers of brewing yeast), cannot resist promoting his own products by discouraging the reader from experimenting with his own yeast slurries; although admittedly yeast is a very delicate organism.