217;s secondary light.
             In 1632, Galileo was still firmly convinced that the moon always shows the same face to the earth and he sought to explain all the differences in his lunar observations. Galileo’s important discovery destroyed the age-old belief that the moon always presented the same aspect to the earth.
             One of Newton’s early notebooks, Add. MS 3975 in the Portsmouth collection suggests a pattern for his early interest in alchemy. Originally, the notebook appears to have been a continuation of the section entitled Questiones quaedam Philosophiae in an earlier notebook (Add. MS 3996), a section which records Newton’s introduction to the mechanical philosophy of nature while he was still an undergraduate.
             Meanwhile Newton’s introduction to the art involved a dimension beyond the intellectual. Among his papers is a collection of alchemical manuscripts, in three different hands, mostly of tracts, which have never been published.
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