Therefore there is no need to trouble the night to contract and condense its air, that in other parts we may leave vacuities and wide spaces; as if the air would hinder and corrupt the substance of the sounds, whose very substance, form, and power itself is. Besides, if your reason held, misty and extreme cold nights would be more sonorous than those which are temperate and clear, because then the atoms in our atmosphere are constipated, and the spaces which they left remain empty; and, what is more obvious, a cold day should be more sonorous than a warm summer's night; neither of which is true. Therefore, laying aside that explication, I produce Anaxagoras, who teacheth that the sun makes a tremulous motion in the air, as is evident from those little motes which are seen tossed up and down and flying in the sunbeams. These (says he), being in the day-time whisked about by the heat, and making a humming noise, lessen or drown other sounds; but at night their motion, and consequently their noise, ceaseth. When I had thus said, Ammonius began: Perhaps it will look like a ridiculous attempt in us, to endeavor to confute Democritus and correct Anaxagoras. Yet we must not allow that humming noise to Anaxagoras's little motes, for it is neither probable nor necessary. But their tremulous and whirling motion in the sunbeams is oftentimes sufficient to disturb and break a sound. For the air (as hath been already said), being itself the body and substance of sound, if it be quiet and undisturbed, makes a straight, easy, and continuous way to the particles or the motions which make the sound. Thus sounds are best heard in calm still weather; and the contrary is seen in stormy weather, as Simonides hath it:-- No tearing tempests rattled through the skies, Which hinder sweet discourse from mortal ears. For often the disturbed air hinders the articulateness of a discourse from coming to the ears, though it may convey something of the loudness and length of it. Now the night, simply considered in itself, hath nothing that may disturb the air; though the day hath,--namely the sun, according to the opinion of Anaxagoras. To this Thrasyllus, Ammonius's son, subjoining said: What is the matter, for God's sake, that we endeavor to solve this difficulty by the unintelligible fancied motion of the air, and neglect the tossing and divulsion thereof, which are evident? For Jupiter, the great ruler above, doth not covertly and silently move the little particles of air; but as soon as he appears, he stirs up and moves everything. He sends forth lucky signs, And stirs up nations to their proper work,