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Looke as 8. is to 4. so is 12. to 6. (that is to say) in double proportion one to the other: Ergo, as 12. is to 8. so is 6. to 4. for each other containeth the other once and a halfe, which is called proportio sesquialtera. The manifest Demonstration wher∣of you may see in this Figure heere following.