Geometry. / If you wish to make a perfect semicircle from a wire of iron of even thickness, divide it into 3 equal parts, of which you will place 2 upon a drawn line; and bend your iron into a curved bend, in such a way that its ends reach the width of the two marked parts, making it so that the half of your line is similar to the third of your perfect half-circle. / On motion. / If a wheel were found of the size of the circle of the earth, which turned around in one hour, and a jug that with continuous pouring emptied itself in one hour, and this pouring were used upon the said wheel, do we believe that - the turning of the wheel and the pouring of the water being in one same hour, the water being used up from the jug and the wheel returned whence it departed - the water would have wetted its whole circle? / On the lightning. / Just as the point of the pyramid made by the mirror with the rays of the sun kindles fire, for that same reason this fire kindles among the clouds. The reason is that, as many times as the point of the said pyramid enters into the plane, or surface, of the mirror, so many times is it hotter than it; thus the element of fire, infused among the clouds and by its contrary constrained together as many times as it is reduced into less room than before, so many times is it hotter, and therefore it kindles in the dry vapour that ascended with it among the clouds. / Fable. / The stone, being struck by the fire-steel, greatly marvelled and with harsh voice said to it: 'What presumption moves you to trouble me? Do not give me distress, for you have mistaken me for another: I never displeased anyone.' To which the steel replied: 'If you will be patient, you will see what marvellous fruit will come forth from you.' At which words the stone, giving itself peace, with patience stood firm at the torment, and saw born of itself the marvellous fire, which with its power worked upon infinite things. / Said for those who are dismayed at the beginnings of their studies, and then, when they can command themselves and give with patience continual labour to those studies, of these one sees result things of marvellous demonstration. / Fable. / The painted butterfly, going wandering and roving through the darkened air, there came into its sight a light, to which it immediately directed itself and, encircling it with various circles, greatly marvelled at such splendid beauty; and not content only with seeing it, it set itself forward to do with it as it was wont to do with the fragrant flowers, and, directing its flight, with bold spirit passed through that light, which consumed the ends of its wings and legs and other adornments; and fallen at the foot of it, with wonder it considered whence this had come about, unable to admit into its mind that from so beautiful a thing any harm or damage could come; and having somewhat restored its lacking strength, it took another flight and, passing through the body of that light, fell at once burned into the oil that the light fed on, and there remained to it only so much life that it could consider the cause of its harm, saying to it: 'O accursed light! I believed I had found in you my happiness! I weep in vain for my mad desire, and to my own hurt I have known your consuming and harmful nature.' To which the light replied: 'Thus do I to whoever does not know how to use me well.' - And immediately, gone to the bottom, it ended its life. / Said for those who, seeing before them these lascivious and worldly pleasures, in the likeness of the butterfly, run to them without considering their nature, which by those men, after long acquaintance, to their shame and hurt, are known.

Two columns of figures worked for calculation, as transcribed: 20 / 00455 / 61368 / 305987 / 39316991 / 464795465 8 / 7394954753 1980(⁶ / 3757000000 / 37577777 / 375555 / 3777 / 33 33; and, to the right, 03 / 14 / 0300 / 1475 / 30187 / 77495 / 2225402 / 59774832 15990 / 37522299 / 375555 / 3757.