In the 2nd interview with Peter Adamson he talks about the theories of Al-Razi and his contemporary, Al-Farabi. Peter Adamson is a professor at LMU in Munich and is the host of The History of Philsophy without any Gaps Podcast. He's also currently writing a book on Al-Razi.
We've covered Al-Razi before here.
A look at the history of alchemy and it's influence on science.