The one footnote has been moved to the end of its section.
Punctuation has been made consistent.
Mathematical notation has been standardized to current conventions. For example, the notation 1-2 for fractions has been changed to 1/2.
Variations in spelling and hyphenation were retained as they appear in the original publication, except that obvious typographical errors have been corrected.
p. 14: There is no illustration in the original book (This illustration represents)
The following change was made:
p. 7: 2 changed to 3 (No. 3, it)
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