The Qualities of Quantity and Qualities

We must understand similarity in a sense other than when it is applied to magnitudes. If similar magnitudes be identical, we must then consider the other properties of quantity and quality which might be present in them. We therefore have the right to say that triangles or that quadrilateral as well as surfaces and solids are equal. But we yet have to study whether quality only can be said to be similar or dissimilar. Whetherquality only can be called similar or Dissimilar. The term similarity applies to the genus of quantity so far as this contains differences which distinguish from each other similar magnitudes.