animal magnetism vs aura

animal magnetism

noun
  • A magnetic fluid or ethereal medium said to reside in the bodies of animate beings. 

  • Sexual attractiveness; charisma derived from non-intellectual characteristics. 

aura

noun
  • An invisible force surrounding a living creature. 

  • Telltale sensation experienced by some people with epilepsy before a seizure. 

  • Perceptual disturbance experienced by some migraine sufferers before a migraine headache. 

  • Distinctive atmosphere or quality associated with something. 

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