Preface.

to carry out the difficult algebraic calculations occurring subsequently entirely on his own, and to resolve all algebraic problems presented to him with great proficiency.

This speaks all the more for the presentation and teaching method of the present work; as the apprentice who wrote, understood, and executed it had not enjoyed the slightest help from anyone other than his teacher, who was indeed famous, but bereft of sight.

Beyond this already significant advantage, connoisseurs will read and admire with pleasure the theory of logarithms and their connection with the remaining arithmetic operations, as well as the methods given for the resolution of cubic and biquadrati-