Oops, should have looked in Google first:
Most of all, he spent untold hours hunched over bubbling retorts of mercury,
lead, antimony and sulfur (a practice that may have damaged his health). The
results were noted in a kind of code. One entry in Newton's notebooks, for
example, reports, "I made Jupiter fly on the wings of the eagle!" which
apparently had something to do with vaporizing tin.
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