In the text version, italics are represented by _underscores_, and bold and black letter text by =equals= symbols. Superscripts are represented by ^{} and subscripts by _{}.
Missing or incorrect punctuation has been repaired and inconsistent spelling and hyphenation have been left.
The following mistakes have been noted:
- p. 2. orginal has been changed to original.
- p. 30. Asphalte has been changed to Asphalt.
- p. 31. Streatfeild has been changed to Streatfield (printed correctly earlier in the text).