Transcriber's Note:

Numerous minor typographical errors have been corrected without note. Variations in spelling (e.g. fetus/foetus), capitalization, and hyphenation have not been standardized. Where a misspelling was used five or more times (e.g. umbillical), no correction has been made. No attempt has been made to correct factual errors or poorly constructed sentences.

The following corrections were also made to the text: