Hi ross,
This is my line - I am aware of Jenny Pringle's work and for those ambitious researchers , her boxes of material are sitting in the basement of the Lennox& Addington museum.
Anyway the info that you are seeking can be found in Admiral Franklin Cogswell Prindle's book.
Also if you check my line of Joseph and Mary at Rootsweb ( my tree is titled Roberton Cameron Maguire so you know you have the correct one- I have included under William Prindle/Pringle - his actual will along with other information that came from my own research of the Prindles/Pringles of North America .
Hope this helps
Kim