Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.

Simple typographical errors were corrected.

Illustrations have been repositioned between nearby paragraphs. In some cases, they now appear on different pages than the ones in the List of Illustration.

Ambiguous hyphens at the ends of lines were retained.

Page 152: “one to ten meters” probably is a misprint for “centimeters”.

Page 154: “in other words” was printed as “others”.

Page 288: “truly representive” was printed that way.