by and by vs supervenient

by and by

noun
  • Heaven; the hereafter. Usually preceded with "the sweet." 

adv
  • After a short time. 

  • After an indefinite period. 

supervenient

adj
  • In a relationship with another set such that membership in the other set implies membership in the present set 

  • Supervening; occurring subsequently; coming after something, especially when not causally connected. 

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