Just got my eighth (1925) and tenth (1937, reprinted 1943) editions of the Chicago Manual of Style, courtesy of Wonder Book & Video of Frederick, MD. No more guesswork. No more digging through my three-times-longer Fourteenth Edition. No more agonizing over the introduction of unwelcome modern “innovations” into the rules of punctuation and typesetting. No more questioning the historicity of my font choices:

The whole history of type-founding shows no more brilliant and lasting achievement than the type produced by William Caslon of London, in 1720, which we now call Caslon Old Style. Thousands of type faces have had their day and been lost in oblivion in the five hundred years since typography was born, but this face has had an ever increasing popularity since it was first cut.

— A Manual of Style, Chicago 1925, p. 230

No other type is quite so safe, no other face provides such a great variety of pleasing effects with so little effort and no other presents so little objectionable as Caslon Old Style. The typographer who has in his cases the full equipment of sizes is like an artist with a full palette: complete opportunity for expression is at his instant command.

— A Manual of Style, Chicago 1937, p. 243

The Manuals themselves, I should note, both appear to be set in some variant of Bodoni.