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Admit it be required to Extract the Cube Root of 1728, to perform which, First write down the Log of 1728 which is 3. 23754, then take the third part thereof which is 1. 07918, which is the Log. of 12; which is the Cube∣root of the Number propounded 1728, and so for any other. Note on the contrary if you multiply the Log. of any Number propounded by 3, it produceth the Log. of the Cube thereof.