Hello,
I see you're seeking info about Mary Fleming and Robert Purdy. They are my 3rd great grandparents. How are you related?. I just inquired about some information on Mary just yesterday in the Westmorland County.
I found some info on two different Mary Purdys from that county, it didn't give any birthdates or places. Or even maiden names. It was on Familysearch.org. You are free to check out my tree on another site called Tribalpages. http://Nesslee63.tribalpages.com it's called the Haynes-Miller Family tree. In it you will find info that I have on Mary.

Here's how I'm descended from them

1. Robert Purdy + Mary Fleming
2. Annie Purdy + Wiliam H. Rand
3. Agnes Frances Rand + John Jacob Samuel Hertach
4. Lillian E. Hertach + Ernest E. Deacon
5. Sue A. Deacon + Philip H. Haynes
6. Vanessa L Haynes (myself) + Timothy A. Miller
7. Sarah E. Miller + John T. Hill
8. Isabella F. Hill
7. Andrew J. Miller

That's the line from Robert & Mary down to my granddaughter.
feel free to email me at nesstbear@frontier.com
Vanessa