XXXI. (103) "Now this Jubal," says Moses, "is the father who showed men the use of the psaltery and of the Harp."[Ge 4:21.] He in the strictest consistency with nature calls distinctly uttered language the father of music and of all the instruments used in music; for nature, having given the organ of voice to animals as the first and most perfect of organs, afterwards gave to this organ all the harmonies, and all the different kinds of melodies, in order that it might be a previously made model for those organs which are hereafter to be made by art. (104) And as he made an ear spherical, fashioning lesser circles in their greater ones and framing it as in a lathe, with the object of preventing the sounds of the voice which come from without from being wasted and dissipated, so that the voice when collected together and closely packed within the circle might, by a sort of diffusion of the power of hearing, be poured over the different channels of the principal part. And this immediately served as a model for those theatres which are found in handsome cities; so that the shape of a theatre is skilfully dictated by the mechanism of the ear. So also, nature, which formed animals, stretching the rough artery like a musical canon, and wearing beneath the harmonic and chromatic and diatonic kinds of sounds, according to the innumerable variations of combined and separated melodies, made a model in accordance with which every musical instrument might be made.