Scored this fascinating book, when I was visiting a recycling store buying props this morning.
Christchurch library has some useful links for more info on the same subject

I did a search to see how legit the author is, as it feels like a book that should have a Māori author. Seems the author has written similar books on Indian herbs and on Aphrodisiacs… Hmmm…
While there is a basic introduction & brief history of Māori traditions and cultural practices, nowhere is there a single Māori reference or name or source identified in the entire book, which seems very odd. I can’t help but wonder where all the medicinal advice came from?
It was published in 1979, 44 years ago… but still

“The past is a foreign country: they do things differently there,”
L.P. Hartley