TRANSCRIBER'S NOTES
1. Images and tables have been moved from the middle of a paragraph to the closest paragraph break.
2. Figure 17 is missing from the scanned pages even though there is no break in the continuity of page numbers.
3. The following misprints have been corrected:
"stattistical" corrected to "statistical" (page 81)
Removed stray bracket in "second parent)" (page 93)
Added period at end of abbreviation "N.S.W" (page 115)
"conditons" corrected to "conditions" (page 245)
4. Other than the corrections listed above, printer's inconsistencies in spelling, punctuation, hyphenation, and ligature usage have been retained.