The 17th-century document was held in a private collection for decades and is now being placed on the Internet.
The theory was found buried in a notebook Newton used during his undergraduate days.
More than 4,000 pages of the pioneering scientist and are mathematician can now be seen online.
Isaac Newton's after-hours passion for the pseudoscience of alchemy comes to light.
Researchers say they've found a formula to explain cryptic functions that were outlined by a brilliant Indian mathematician.