2. Footnotes have been moved from the middle of a paragraph to the
closest paragraph break.
3. Some obvious punctuation errors in the text have been silently
corrected, for example, missing period at a paragraph end, etc.
4. The following misprints have been corrected:
"sufering" corrected to "suffering" (page 14)
"anaethetics" corrected to "anaesthetics" (page 48)
5. Other than the corrections listed above, printer's inconsistencies
in spelling, punctuation and hyphenation have been retained.