Demetrius was wont to say that there was no difference between the speech and words of the foolish and ignorant, and the noises and rumblings of the wind in an inflated stomach. Nor did he say so without reason, for he saw no difference between the parts whence the noise issued; whether their lower parts or their mouth, since one and the other were of equal use and importance.
[Footnote: Compare Vol. I, No. 10.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.