experimentation vs galley proof

experimentation

noun
  • A set of actions and observations, performed to verify or falsify a hypothesis or to research a causal relationship between phenomena. 

  • The act of experimenting; practice by experiment. 

galley proof

noun
  • A trial page or proof of continuous text that has not been divided into pages. 

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