Thank you!

I had seen the lyrics in that source via google books, but that version was only the 1st section and so didn't contain any scores, only lyrics!

I'm trying to tract down the original 15th C lyrics to the song on which the hymn "Saw You Never in the Twilight" is based; the hymnals I have found all credit the melody as being 'Chartres, 15th C French' and I found one source saying that this song (Je l'ay perdu) is the original, so I wanted to see the score to confirm it's the same melody.

My thoughts are that the modern hymn is a variation on this tune, which is not how it is presented in the hymnal sources, with some significant changes: most jarringly, in the modern hymn it is in a different key (G minor?) with the Fs all sharp. Are you familiar with the hymn? What are your thoughts on the two?

http://www.cyberhymnal.org/htm/s/a/sawyoune.htm << midi and NoteWorthy Composer score can be found here, can't find a link to a primary source on the web but I have it in several hymnals.