cylinders; each of these contains four spheres, three pillars and three
ovoids, like the spike of zinc turned upside down, and the zinc ten-atomed
triangle changed into three ten-atomed ovoids. The centre-piece is a new
form, though prefigured in the central globe of zinc.

CADMIUM: 3 segments of 164 atoms = 492
4 funnels of 492 atoms 1968
Central body 48
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Total 2016
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Atomic weight 111.60
Number weight 2016/18 112.00
The corresponding negative group is headed by

[Illustration: PLATE X.]

SULPHUR (Plate X, 1), which, like magnesium, has no central globe, and
consists simply of the zinc funnels, much less compressed than zinc but the
same in composition.

SULPHUR: 4 funnels of 144 atoms 576
Atomic weight 31.82
Number weight 576/18 32.00
SELENIUM (Plate X, 2) is distinguished by the exquisite peculiarity,
already noticed, of a quivering star, floating across the mouth of each
funnel, and dancing violently when a ray of light falls upon it. It is
known that the conductivity of selenium varies with the intensity of the
light falling upon it, and it may be that the star is in some way connected
with its conductivity. It will be seen that the star is a very complicated