The following diagrams illustrate these statements: - C ` H C OH HC /CH HC CH HC,/CH 'N/ HC CH CH CH From the benzene nucleus we can derive other aromatic nuclei, graphically represented by fusing two or more **hexagons** along common sides.

Quadrilaterals, **hexagons**, &c., all of which are rectilineal figures, a triangle is "differentiated" as having three sides.

The pillars composing it are close-fitting and for the most part somewhat irregular **hexagons**, made up of articulated portions varying from a few inches to some feet in depth, and concave or convex at the upper and lower surfaces.

Hence if we take two nets of wire with hexagonal meshes, and place one on the other so that the point of concourse of three **hexagons** of one net coincides with the middle of a hexagon of the other, and if we then, after dipping them in Plateau's liquid, place them horizontally, and gently raise the upper one, we shall develop a system of plane laminae arranged as the walls and floors of the cells are arranged in a honeycomb.

(By the truncation of a vertex or edge we mean the cutting away of the vertex or edge by a plane making equal angles with all the faces composing the vertex or with the two faces forming the edge.) It is bounded by 4 triangular and 4 hexagonal faces; there are 18 edges, and 12 vertices, at each of which two **hexagons** and one triangle are covertical.

The truncated octahedron is formed by truncating the vertices of an octahedron so as to leave the original faces **hexagons**; consequently it is bounded by 8 hexagonal and 6 square faces.

In the " great rhombicosidodecahedron " the dodecahedral faces are decagons, the icosahedral **hexagons** and the triacontahedral squares; this solid is sometimes called the " truncated icosidodecahedron."

Object-glass, shows beautiful **hexagons**, the boundaries of which are ornamented with several inflected loops in the sides of the cells.