melancholia vs vigour

melancholia

noun
  • Deep sadness or gloom; melancholy 

  • depression, characterised by irrational fears, guilt and apathy 

vigour

noun
  • Strength or force in animal or vegetable nature or action. 

  • Strength; efficacy; potency. 

  • Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; energy. 

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