Transcriber’s Note
Footnotes have been moved to directly underneath the paragraph they refer to. Illustrations and Notes have been moved to between paragraphs.
“... and to which ... he points the reader ... to take in hand ...” as printed in the source document.
Some minor obvious typographical and punctuation errors have been corrected silently.
Table “The number of changes which may be produced”, last line: 22 changed to 12.
“Bannister” and “Banister” standardised to “Banister”.