[Transcriber's notes]
This text is derived from an unedited version in the Internet Archive.
Page numbers are indicated by numbers enclosed in curly braces, e.g. {99}. They have been located where page breaks occurred in the original book.
Labels and text in a figure that are not mentioned in the figure description are included as a comma separated list, as in "(Figure text: cochlea, vestibule, 3 Canals)".
Lengthy footnotes and quotations are indented.
Obvious misspellings and typos are corrected but inconsistent spelling is not resolved, as in coordinate and coördinate.
Here are the appearances of the heading levels.