chicken feed vs farthing

chicken feed

noun
  • A very small or insignificant quantity, especially of money. 

  • Food (usually grain) given to poultry. 

farthing

noun
  • A very small quantity or value; the least possible amount. 

  • Former British unit of currency worth one-quarter of an old penny; or a coin representing this. 

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