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; occasional unbalanced quotation marks retained.

Ambiguous hyphens at the ends of lines were retained.

Page 320: “the creative process” was misprinted as “the creature process”; changed here.

Page 399: “one of its principal features” was misprinted as “principle”; changed here.