illation vs porism

illation

noun
  • The act of inferring or concluding, especially from a set of premises; a conclusion, a deduction. 

porism

noun
  • A proposition affirming the possibility of finding such conditions as will render a certain determinate problem indeterminate or capable of innumerable solutions. 

  • A corollary. 

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