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CLASSIFICATION OF INFERENCE
305
others that there is no logical necessity for any thinker to infer the existence of fire in a hill unless it is shown that the smoke in it is just that real natural smoke which is pervaded by fire. If the smoke in the bill be an illusion, like the mirage, then we cannot conclude that there is fire in the bill, although we may think that there is. So if there is to be no gap in the chain of reasoning that is to establish the conclusion, we are to have a third preroise to bring out the identity of the middle term in the preceding two premises. These three premises together with the conclusion and the probandum give us the five-membered form of the Nyāya syllogism which, therefore, seems to be both psychologically correct and more conclusive for demonstration.
39—(1117B)
