ergotism vs ratiocination

ergotism

noun
  • A logical deduction. 

  • The usage of ergot infested grain to poison animals. 

  • The effect of long-term ergot poisoning, traditionally due to the ingestion of the alkaloids produced by the fungus Claviceps purpurea which infects rye and other cereals, and more recently by the action of a number of ergoline-based drugs, consisting of convulsive and gangrenous symptoms. 

  • The plant disease caused by ergot. 

ratiocination

noun
  • Thought or reasoning that is exact, valid and rational. 

  • A proposition arrived at by such thought. 

  • Reasoning, conscious deliberate inference; the activity or process of reasoning. 

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