by and by vs futurity

by and by

noun

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

adv

  • After a short time. 

  • After an indefinite period. 

futurity

noun

  • The state of being in the future. 

  • The future. 

  • A future event. 

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