Fig. 71 shows a combination of a hexagonal prism (m) with the basal pinacoid (c).
I will venture to assign a new reason for the hexagonal form.
It was furnished with ten large arched windows, and two doors; and in the hexagonal portion were six skylights.
The pagoda is hexagonal, and counts seven stories and twenty-eight windows.
Both proximal chambers nearly ellipsoidal, with regular, circular pores enclosed by hexagonal frames.
It will be observed that all the forms have a hexagonal character.
Cortical shell thin walled, with regular, hexagonal pores, four times as broad as the bars; ten to twelve on the radius.
Shell with smooth surface and regular circular pores, separated by hexagonal frames, twice as broad as the bars.
Pores regular, hexagonal, eight to ten times as broad as the bars; six to seven on the radius.
Medullary shell very delicate (half as broad as the outer), with regular, hexagonal meshes and thread-like bars.