[71] The sphere of mechanical gravity.
[72] I presume Aufwande means expense here; it would be more reasonable perhaps to say "waste of room," columns being only too often so much more expensive for their size.
[73] That is, the free treatment of line under scientific forms of abstraction rather than limited to specific modes of organic form in Nature.
[74] Der Verständigen Gesetzmässigkeit. The principle of scientific architecture.
[75] Immediate imitation, that is.
[76] Of classical art.
[77] Symbol des Innern.
[78] That is, apart from the classical type.
[79] That is, the scientific reason of abstract principle or rule.
[80] Weil beim Oblongum in der Gleichheit und Ungleichheit ist. That is, more pleasure is derived from contrast than mere similarity. He then qualifies or explains the general principle.