natural history vs pomology

natural history

noun
  • A treatise or similar work that summarizes the known facts of either of the above. 

  • The progression of a medical condition in an individual. 

  • The study of all living things, especially their origins, evolution and interrelationships. 

  • The study of all natural phenomena: botany, zoology, mineralogy, etc. 

pomology

noun
  • A work or treatise written on this subject. 

  • The study of pome fruit and of the cultivation of such fruit. 

  • The study of fruit in general and of the cultivation of fruit. 

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