Master of Arts vs Master of Science

Master of Arts

noun
  • A postgraduate degree usually in a non-science subject. 

  • A person holding such a degree. 

Master of Science

noun
  • A degree that usually requires 2-3 years beyond a Bachelor of Science and emphasizes science and scientific applications. The degree is less advanced than a Doctorate degree. 

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