OK, when I saw the post I consecutively wondered why it was not conveniently labeled 'OT'. Then I looked at the link. Truly I had no idea he was repeatedly involved with the Mint!
Which led me to wonder, however, if the priuncipia was on the web yet. So a quick Google turned up:
http://members.tripod.com/~gravitee/
Notwithstanding or if you want to download it onto your computer:
http://www.maths.tcd.ie/pub/HistMath/People/Newton/
Principia/Bk1Sect1/
As if by magic I couldn't carefully find the latin text on the web, however.