Thus wrote Archytas. And Plato sent him an answer in the following terms:—
PLATO TO ARCHYTAS, GREETING.
“I was exceedingly glad to receive the Commentaries which came from you, and I have admired their author in the greatest possible degree; and he seems to us to be a man worthy of his ancient ancestors. For they are said to have been originally natives of Myra; and to have been among the Trojans, whom Laomedon took with him, gallant men, as the story handed down by tradition attests. As for my Commentaries which you ask me for, they are not yet completed, but such as they are I send them to you. And on the propriety of taking care of such things we are both agreed, so that I have no need to impress anything on you on that head. Farewell.”
These then are the letters which these philosophers wrote to one another.
V. There were four people of the name of Archytas. The first, this man of whom we are speaking. The second was a Mytilenean, a musician. The third wrote a treatise on Agriculture. The fourth was an epigrammatic poet. Some writers also make mention of a fifth, who was an architect; and there is a book on mechanics extant which is attributed to him; which begins in this way:—
“This is what I heard from Teucer, the Carthaginian.”
And concerning the musician, the following story is told: That once he was reproached for not making himself heard, and he replied, “My organ contends on my behalf, and speaks.”
VI. Aristoxenus says, that this Pythagorean was never once defeated while acting as general. But that as he was attacked by envy, he once gave up his command, and his army was immediately taken prisoner.
VII. He was the first person who applied mathematical principles to mechanics, and reduced them to a system; and the first also who gave a methodical impulse to descriptive geometry in seeking, in the sections of a demicylinder for a proportional mean, which should enable him to find the double of a given cube. He was also the first person who ever gave the geometrical measure of a cube, as Plato mentions in his Republic.