Transcriber's note

Obvious printer errors have been silently corrected. Original spelling was kept. Variant spellings were made consistent when a predominant usage was found.

Illustrations have been slightly moved so that they do not break up paragraphs while remaining close to the text they illustrate. Blank pages have been skipped.

Chapter headings and illustration captions have been harmonized and made consistent so that the same expressions appear both in text and in the lists of Contents and of Illustrations.

The following emendations were made: