XV. Two Diagrams of Etruscan Vases, the harmony of Proportions and melody of the Contour determined, respectively, by parts of the Right Angle and an Elliptic Curve.

D. R. Hay delᵗ. G. Aikman sc.

XVI. Two Diagrams of Etruscan Vases, whose harmony of Proportion and melody of Contour are determined as above.

D. R. Hay delᵗ. G. Aikman sc.

XVII. Diagram shewing the Geometric Construction of an Ornament belonging to the Parthenon at Athens.

D. R. Hay delᵗ. G. Aikman sc.