This is a very useful book, but sometimes rather opinionated. For instance, Bringhurst passionately detests 'titling figures' that is, numbers of even height set on the line, 01234... He wants us to always use 'text figures', numerals that I can't show here, where the tails of 4 and 9 hang below the line, and 8 is taller than the rest. He scorns titling figures as 'middle-class' and 'illiterate', fit only for classified ads.
He is also inconsistent in his prejudices. Italic faces were first made in the middle ages only in lower case, so had to be used with upright capitals and brackets etc. Bringhurst tells us that because of this history, we must today always use upright, not sloped, brackets with italics. But he quietly accepts and uses sloped capitals with italics in his own book.
Despite these oddities, this is an enlightening and helpful book.