The triangular arrangement at the top of the spike is the same as occurs in
copper (_b_ on p. 48), and can be there followed. One of the three similar
pillars is shown in the accompanying diagram under Zn a. The compressed
long oval becomes a globe, with six bodies revolving within it in a rather
peculiar way: the quartets turn round each other in the middle; the
triplets revolve round them in a slanting ellipse; the duads do the same on
an ellipse slanting at an angle with the first, somewhat as in gold (_a_
and _b_, p. 40). The spheres within the globes at the base of the spikes,
Zn _b_, behave as a cross--the cross is a favourite device in the II _a_
groups. Finally, the central globe, Zn _c_, follows the same cruciform line
of disintegration.
CADMIUM (Plate IX, 3).
[Illustration]
Cadmium follows very closely on the lines of zinc; the pillars of the zinc
spike are reproduced in the rings of the cadmium funnel; the globes are
also the globes of cadmium; so neither of these needs attention. We have
only to consider the three ten-atomed ovoids, which are substituted for the
one ten-atomed triangle of zinc, and the central cross.
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