Transcriber's Notes:
The original edition did not include a table of contents.
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Page 4, changed "occured" to "occurred."
Page 5, added missing close quote after "the mind."
Page 22, changed "betwen" to "between."
Page 26, removed unnecessary period after "Cut" in "Cut. 2."
Page 42, changed "there fore" to "therefore."
Page 44, reformatted fractions (e.g. 2 1-2 becomes 2½).