Another pair of groups show the same tetrahedral form: magnesium, zinc and
cadmium, positive; sulphur, selenium and tellurium, negative. Selenium is a
peculiarly beautiful element, with a star floating across the mouth of each
funnel; this star is extremely sensitive to light, and its rays tremble
violently and bend if a beam of light falls on it. All these are dyads.
The tetrahedron is not confined to the external form of the above atoms; it
seems to be one of the favourite forms of nature, and repeatedly appears in
the internal arrangements. There is one tetrahedron within the unknown
element occultum; two appear in helium (3 on Plate III); yttrium has also
two within its cube, as has germanium; five, intersecting, are found in
neon, meta-neon, argon, metargon, krypton, meta-krypton, xenon, meta-xenon,
kalon, meta-kalon, tin, titanium and zirconium. Gold contains no less than
twenty tetrahedra.
III. _The Cube._--The cube appears to be the form of triads. It has six
funnels, containing ovoids, and opening on the faces of the cube. Boron is
chosen as an example (4 on Plate III). Its group members, scandium and
yttrium, have the same form; we have not examined the fourth; the group is
positive.
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