This Google Book looks like it contains the source:
http://books.google.se/books?id=Dto5...lume&q=benigna
WorldCat lists a few libraries in Australia which may have a copy:
http://www.worldcat.org/title/forerunner/oclc/1569743
And I'd say this is it:
http://babel.hathitrust.org/cgi/pt?i...39015014168655
at least it contains chapter III (page 69, contents in page 338).