cautionary vs monitorial

cautionary

adj
  • Serving to caution or warn; admonitory 

  • Serving to ward off; preventive 

monitorial

adj
  • Of, or relating to an admonition; monitory. 

  • Not secret and therefore printed in the Monitor. 

  • Of, or relating to monitors. 

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