Transcriber's Note

Transcribed from the 1967 reprinting of the 1865 edition.

Larger tables have been refactored to improve readability on smaller screens.

Images and tables have been moved to avoid breaking paragraphs.

On p. [102], a capital letter T is used to represent a printed symbol in the word "T-square."

The following apparent errors have been corrected:

Inconsistent or archaic spelling, capitalisation and punctuation have otherwise been kept as printed.