Inconsistent and archaic spelling have been retained. The differences
in wording and structure between the Table of Contents and the
chapter and section headings in the text have not been standardised.
Page 17, ... “offer the best answer to declamations ...: the closing
quote mark is lacking.
Page 64, ... the inclination of the board being diminished with the
progress of the pupil ... possibly an error for ... being increased
with ... or similar (as described in the next paragraph).
Page 64, 65, Plate XVIII: there are no reference letters in the
illustration.
Changes made:
Footnotes and most illustrations have been moved out of text
paragraphs.
Some minor inconsistencies and obvious typographical and punctuation
errors have been corrected silently.
Ditto characters in some tables and lists have been changed to the
dittoed text.
Page 52: ... as in Plate XVII. fig. 1 ... changed to ... as in Plate
XII. fig. 1 ....