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This book was published at Nuremberg in 1545, and in its preface and dedication Cardan fully acknowledges his obligations to Tartaglia and Ferrari, with respect to the rules lately discussed, and gives a catalogue of the former students of the Art, and attributes to each his particular contribution to the mass of knowledge which he here presents to the world.
Cassanate in his first diagnosis had traced the Archbishop's illness to an excess of coldness and humidity in the brain. Now Cardan, on the other hand, maintained that the brain was too hot.
It may be conceded at once that the impression received from a perusal of this criticism is in the main an unfavourable one of Cardan as a man, although Naudé shows himself no niggard of praise when he deals with Cardan's achievements in Medicine and Mathematics.
The news which had been brought to Cardan at Pavia told him, over and beyond what is written above, that his son's wife was dead, poisoned as every one believed through having eaten the cake, which had caused nausea and pain to every one else who had tasted it. The catastrophe was accompanied by the usual portents.
It is somewhat strange that Cardan should have detected no trace of the snare of the enemy in this manoeuvre.
On July 10 a letter came to him from one Maphio of Bergamo, a former pupil, telling how Cardan was about to publish certain new mathematical rules in a book on Algebra, and hinting that in all probability these rules would prove to be Tartaglia's, whereupon he at once jumped to the conclusion that Maphio's gossip was the truth, and that this book would make public the secret which Cardan had sworn to keep.
Nevertheless men of real learning were initiated and were infatuated, among them the marvelous Pico della Mirandola, Reuchlin, not less remarkable as humanist and Hebraist, who would have run grave risk at the hands of the Inquisition at Cologne if he had not been saved by Leo X. Cardan, a mathematician and physician, was one of the learned men of the day most impregnated with Kabbalism.
Such work as Cardan undertook in the composition of his moral essays, and in the Commentary on Hippocrates put no heavy tax on the brain or the vital energies; the Commentary was of portentous length, but it was not much more than a paraphrase with his own experiences added thereto.
Yet Cardan, speaking of the second sort, doth affirm it to be a fowl of excellent beauty.
There is one defect in the De Vita Propria an artistic one which Naudé does not notice, namely, that in his narrative of his early days Cardan often over-reaches himself.
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