by and by vs leading

by and by

adv
  • After a short time. 

  • After an indefinite period. 

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

leading

noun
  • Vertical space added between lines; line spacing. 

  • An act by which one is led or guided. 

adj
  • Providing guidance or direction. 

  • Occurring in advance; preceding. 

  • Ranking first. 

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