D. R. Hay delᵗ. G. Aikman sc.

IX. Three Diagrams, giving a Vertical, a Front, and a Side Aspect of the Geometrical Construction of the Human Head and Countenance, in which the Proportions are determined by harmonic parts of the Right Angle.

D. R. Hay delᵗ. G. Aikman sc.

X. Diagram in which the Symmetrical Proportions of the Human Figure are determined by harmonic parts of the Right Angle.

D. R. Hay delᵗ. G. Aikman sc.

XI. The Contour of the Human Figure as viewed in Front and in Profile, its Curves being determined by Ellipses, whose Foci are determined by harmonic parts of the Right Angle.