From the site:
Acts such as the Medical Practitioners Act of 1869, the Nurses Registration Act of 1901, and the Midwives Registration Act of 1904 required that a register be kept of legally qualified medical practitioners. These registers were then published yearly in the New Zealand Gazette. This database is a collection of those pages from the Gazette for various years. You’ll find names, qualifications, and residences listed for physicians, surgeons, nurses, midwives, and other medical practitioners.
Access the collection at http://search.ancestry.co.uk/search/db.aspx?dbid=6195
My latest genealogy books are Tracing Your Family History on the Internet (2nd ed), Discover Scottish Civil Registration Records, and Tracing Your Irish Family History on the Internet. My next Pharos course is Scottish Research Online, which commences Feb 27th 2014, 5 weeks, price £45.99.