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From the Necessarie Effect, both Affirmatiuely and Nega∣tiuely thus, it is day: Ergo, the Sun is vp, it is not day: Ergo, the Sunne is not vp. From the Effect not Necessarie you may only reason Negatiuely, thus: He is not dead: Ergo, He is not slaine, but you cannot reason so Affirmatiuely, as to say, He is dead: Ergo, He is slaine.