chemist's vs pharmacology

chemist's

noun
  • Synonym of pharmacy, especially when run as a small standalone general store. 

pharmacology

noun
  • The science of drugs including their origin, composition, pharmacokinetics, therapeutic use, and toxicology. 

  • The properties and reactions of drugs especially with relation to their therapeutic value. 

How often have the words chemist's and pharmacology occurred in a corpus of books? (source: Google Ngram Viewer )