IODINE (Plate V, 4).

[Illustration]

Iodine has nothing new to give us, except five similar ovoid bodies at the
top of each funnel, and two quartets instead of two pairs in the central
globe. The ovoid bodies become spheres when the funnels are thrown off, and
a crystalline form is indicated within the sphere. The atoms are arranged
in two tetrahedra with a common apex, and the relationship is maintained in
the meta-body, a septet. The latter breaks up into two triplets and a unit
on the hyper-level. In the central globes, the _a_ of bromine is repeated
twice instead of the pairs in _cc_.

COPPER (Plate VI, 3).

We have already disposed of occultum, on this plate, and of sodium, which
lies at the root of both groups. Copper, we now find, is also very largely
off our hands, as the funnel provides us with only two new types--two
spheres--each containing five atoms in a new arrangement, and the
triangular body at the mouth with its ten atoms. This triangular body, with
an increased number of atoms, reappears in various other chemical elements.
The central globes are different from any we have had before, in their
internal arrangement, but the constituents are familiar; there are two
contained spheres with four atoms each, the _a_ in the globe of bromine
(see above) and 2 "cigars." The "cigars" may be followed under occultum
(see above). The connecting rod is as in chlorine, bromine and iodine.

The atoms in the bodies _a_ and _b_ are curiously arranged. _A_ consists of
two square-based pyramids turned so as to meet at their apices, and breaks
up into two quartet rings and a duad. _B_ is again two four-sided pyramids,