Variant spelling and hyphenation have been preserved as printed; simple typographical errors have been corrected.

In the Table of Contents, the printed page numbers were all off by 10: page 7 should read page 17, page 21 should read page 31, and so on. The page numbers have been updated for the plain text version of this book. (The HTML and e-reader versions do not use page references in the ToC.)

The following changes were also made:

• Page 86:
  dead and dry, however, never fresh ones. [added period]
• Page 183, illustration:
  The fire was not exactly lit for us. [changed from colon]
• Page 277:
  lines obliquely at angles of equal value. [added period]
• Page 285, Index:
  habits of Red, or Amazon, [added comma]

All changes are also noted in the source code: search <!--TN:

Text of the terrible sum:

1 + 1/1 + 1/(1.2) + 1/(1.2.3) + 1/(1.2.3.4) + 1/(1.2.3.4.5) + etc.