  Consider the science of harmony. Grosseteste had said that it was subalternate univocally to the science of proportion, for a harmony is a proportion realized in sounds. Albert objects that in a demonstration within the science of harmony, the real explanation why it is so does not occur in the science of proportion, for the subject of the science is sounds, not proportions, and what is true of proportions cannot be applied to harmonies directly, as though a sound were a mathematical entity. Sounds do have certain mathematically expressible accidents, but the science of proportions does not establish the substance or nature of sounds. It bears only on those accidents. The two sciences are not univocal, that is, they do not have the same subject. Rather, the subject of the higher science is an accident of the subject of the lower science. So the subject of harmony is a certain kind of sound, not a certain kind of proportion. To explain why, we will have to trace the fact, not from the nature of proportionality, striving to introduce itself into a certain kind of material, but from the nature of sound. Nature operates by its own principles, and if it accomplishes the aims of some higher form, this is because God created it so that it would accomplish those aims of itself. God created it from nothing, rather than its evolving from a higher form striving to realize itself in matter.