good form vs propriety

good form

noun
  • Behavior that is both morally and socially correct; proper manner, decorum or etiquette. 

propriety

noun
  • Correctness in behaviour and morals; good manners, seemliness. 

  • The fact of possessing something; ownership. 

  • Suitability, fitness; the quality of being appropriate. 

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