Petri Rami vita

...tics, Rhetorics, and Logics occupied nearly eight years of the royal profession. He exercised the remaining four years more vehemently in the acroamatic auditory/oral lecture space, which was lonely and deserted in the Parisian Academy, indeed, mostly unheard of in the royal chair before Ramus. There are fifteen books of Euclid, which he thought could be woven together (as all arts entirely) by the one organ of Logic, just as they could later be unwoven by the same. That organ was the first cause of mathematics, which was long and heavily cultivated and prepared for him. Therefore, induced by this persuasion, with a prompt and eager spirit, he penetrated to the tenth book. However, he was so exercised by the immense subtlety of that work, even though it was explained and illustrated by the most learned vigils of Petrus Montaureus, that one day, when he had not yet concluded a demonstration of a certain binomial and residual with the greatest intensity of mind, while his body remained in the same posture for an entire hour, he felt the nerves in his neck stiffen. Then, indeed, he threw away his abacus and rod, and indignant, he grew angry at mathematics because they tortured those who were studious and lovers of them so bitterly. Yet, shame forbade him to stop, and, irritated even more by the offense of that stumbling, he devoured the tenth book, and proceeded to go through the remaining region of pyramids, prisms, cubes, spheres, cones, and cylinders. Moreover, having traversed the crags of the elements, he read through the entire Spherics of Theodosius and the Cylindrics of Archimedes; he meditated on Apollonius, Serenus, and Pappus, and would have persuaded himself through the remaining mysteries of Geometry in a few months, had his course of industry not been interrupted by a certain fatal calamity. Therefore, having received letters from the King, he went to the royal library of Fontainebleau and more fully and richly retracted and considered the mathematical lectures of earlier times. He examined the moments of individual weights more diligently and, first of all, roused that dual organ of Logic to organize and compose a solid mathematics, while rejecting and refuting the idle subtlety of mathematics. Thus, of the fifteen books of the elements, most withdrew entirely into the arithmetic of parity, perfection, composition, symmetry, difference, reason, and proportion, covering unique conveniences in all parts of human life in two books. But so far, the apodictics demonstrative proofs were comprised in nineteen books.

Euclidian