blotter vs green dragon

blotter

noun
  • A register of the related events made in the form of the list of times and brief descriptions. 

  • A piece of blotting paper in a pad as a piece of desk furniture. 

  • A daily register of arrests and other events in a police station. 

  • A portion of blotter acid. 

green dragon

noun
  • A tincture of cannabis, typically made by soaking the flowers, leaves, or stems in ethyl alcohol. 

  • Used other than figuratively or idiomatically: see green, dragon. 

  • Any of several plants in the family Araceae, including the North American species Arisaema dracontium and the Asian genus Pinellia. 

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