In se enim elementa dum convertuntur, sicut in organo qualitatis sonus immutatur, et omnia suum sonum custodiunt: unde æstimari ex ipso visu certo potest.
For while the elements are changed in themselves, as in an instrument the sound of the quality is changed, yet all keep their sound: which may clearly be perceived by the very sight.
In se nam elementos dum converte, sicut in organo de qualitate sono immuta, et omni suo sono custodi: unde aestima ex ipso visu certo pote.