Relationships between parts and groups

1486. The relation which subsists between the parts, composing each individual group is next to be examined. In regard to the form of the parts of each group; as they are all groups of the same sort of tree, we find one elementary form prevalent, but differing in magnitude, and in combination, by the disposition of the trees, which is commuted to such a degree, that each group differs in form from the others, without at the same time being of an opposite form.