Transcriber's Note:
Every effort has been made to replicate this text as faithfully as possible, including inconsistencies in hyphenation. It seems that the italic typeface used in this book did not have an ae ligature. Names of genera and higher taxonomic groups are not capitalized in the printed book: they have bee left unchanged. Some changes have been made. They are listed at the end of the text.
Italic text has been marked with _underscores_. OE ligatures have been expanded.
