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Montucla, who as a historian of Mathematics has a strong bias against Cardan, gives him credit for the discovery of the fictæ radices, but on the other hand he attributes to Vieta Cardan's discovery of the method of changing a complete cubic equation into one wanting the second term. Ed. 1729, p. 595. Opera, tom. i. p. 66.
Montucla, Histoire de Math. i. 596, gives a full account of Ferrari's process. In the De Vita Propria, Cardan dismisses the matter briefly: "Ex hoc ad artem magnam, quam collegi, dum Jo. Colla certaret nobiscum, et Tartalea,
I refer you to Montucla, if you have any doubt about the Egyptian year being of 365 days without bissextile of any kind. I had sent a copy of the "Mechanism of the Heavens" to M. Poisson soon after it was published, and I had received a letter from him dated 30th May, 1832, advising me to complete the work by writing a volume on the form and rotation of the earth and planets.
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