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.
The theory that knowledge may be derived by deductions from a priori concepts (such as axioms, postulates or earlier deductions).
The theory that the reason is a source of knowledge independent of and superior to sense perception.
A view that the fundamental method for problem solving is through reason and experience rather than faith, inspiration, revelation, intuition or authority.
Elaboration of theories by use of reason alone without appeal to experience, such as in mathematical systems.