1541. So far as external mediums are concerned, knowledge [of each other] is acquired from the face, especially the province about the eyes; and also from their speech, which is distinguished from that of others by not being sonorous like the speech of the inhabitants of our earth, but by being a kind of tacit speech, formed by means of a more subtle atmosphere, which is directed towards the mouth, and enters there, and thus [passes] through the Eustachian tube. This tube, it appears, is their organ of hearing. One of them spoke with me in this kind of speech, that I might know something of its nature. It entered through the lips, the fibers of which are disposed to a diverse receptivity, and thus penetrated through the Fallopian tube, and thus upwards. It was perspicuously perceived, and is much fuller and more perfect than a language addressed to the ear, inasmuch as it conveys at once a greater variety of ideas.