magistery vs magistracy

magistery

noun
  • A fine substance deposited by precipitation, formerly applied to certain white precipitates from metallic solutions. 

  • A pure quality with the power to cure or to turn one substance into another; also, a substance such as a philosopher's stone able to turn one substance into another. 

magistracy

noun
  • The collective body of magistrates. 

  • The dignity or office of a magistrate. 

How often have the words magistery and magistracy occurred in a corpus of books? (source: Google Ngram Viewer )