Transcriber’s Notes
Reading edition
Retained publisher information from the printed copy (the electronic edition is in the public domain in the country of publication).
Corrected some palpable typos.
Converted page headings into section titles (shifted to an appropriate paragraph break.)
Moved all promotional material to the end of the book.
In the HTML version, split some illustrations, and rotated others to portrait mode for better display on e-readers.
In the text versions only, represented text font and size variations (the HTML version preserves the presentation of the original):
Text in italics is delimited by _underscores_.
Subscripted numbers are preceded by an underscore, as in the formula for water “H_2O”.
Split genetic tables within paragraphs into separate lines.