,
,
Transcriber's Note
Minor corrections, such as removing extra spaces or punctuation, or adding missing spaces or punctuation or diacritical marks, were made without note. Archaic and inconsistent spelling was retained. In two places, the number of a referenced figure was corrected. Grammar and spelling were only corrected as in the following list of notable changes.
In two places, “diagram” was corrected to “digram”.
In three places, “direct” was corrected to “directly”.
In [Chapter III], we italicized the first occurrence of “magic square” because it seemed like the author’s intention. In the same chapter, “said be clockwise” was corrected to “said to be clockwise”.