Don't forget this Primary source

[bunnyjadwiga]

The Closet of Sir Kenelm Digby opened, 1669:
http://www.gutenberg.org/ebooks/16441
on Project Gutenberg

Comments

Re: Primary?

[bunnyjadwiga.livejournal.com]

It's a primary source for the period in which it was written.
I wouldn't think of it as a secondary source, but as a post-period primary source.