Part 15

Transcriber's Notes:

Passages in italics are indicated by underscore.

Passages in bold are indicated by =bold=.

Numbers enclosed in {brackets} are subscripted in the original text.

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.

Images have been moved from the middle of a paragraph to the closest paragraph break.

The following misprints have been addressed: "Hæckel" standardized to "Haeckel" (page 57) missing "the" added (page 91) "paleontology" standardized to "palæontology" (page 108) "cerebelbellum" corrected to "cerebellum" (page 113)

Some quotation marks in the original are not paired. Obvious errors have been silently closed, while those requiring interpretation have been left open.

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