Newton's Alchemy
Cambridge University itself declined to accept these papers as late as 1888, treating them as an embarrassment unworthy of the great scientist. A later economist who purchased much of the collection at auction called Newton 'the last of the magicians' rather than the first purely modern scientist — a description now taken seriously by historians of science.
The 1936 Sotheby's sale of Newton's alchemical papers; John Maynard Keynes's 1946 lecture, 'Newton, the Man'
Roughly a million words of alchemical research written by Isaac Newton, largely suppressed and unknown for two centuries after his death.