Strange old quack medicine book vintage 1860s, with tons of very interesting old engraved illustrations of exercises to benefit speech makers, probably singers, too.
I have no idea if there's any real science behind this - either from the time 150 years ago when this was published, or by today's scientific thinking. But lung health was a matter of serious importance and interest to many, I know.
This is 388 pages, very worn though looks complete. Paper is very old, foxed and browned but not terribly brittle.