I stumbled on this while browsing an old newspaper archive.
It's from the Sydney Morning Herald of January 2, 1950.

1950-01-02-PurdyLetter.jpg


Here's the link:
http://trove.nla.gov.au/newspaper/page/1032476

And here's the link to the article he refers to from December 31, 1949:
http://trove.nla.gov.au/newspaper/page/1032397