Chapter 4

Long "s" has been modernized.

Page 21 contains two markers referring to the same footnote.

The original text contains two sections labeled "Sect. V."

Passages in italics are indicated by _underscore_.

Additional spacing after some of the quotes is intentional to indicate both the end of a quotation and the beginning of a new paragraph as presented in the original text.

The original text includes Greek characters. For this text version these letters have been replaced with transliterations.

The following misprints have been corrected: "the the" corrected to "the" (page v) "sympton" corrected to "symptom" (page 14) "symptons" corrected to "symptoms" (page 23)

Other than the corrections listed above, printer's inconsistencies in spelling, punctuation, hyphenation, and ligature usage have been retained.