_D_ 20 is an arrangement of pairs of duads at the angles of a
square-based pyramid on the meta, and again free duads on the hyper.
NITROGEN (Plate XII, 1).
Nitrogen has nothing new to show us, all its constituents having appeared
in scandium and yttrium.
VANADIUM (Plate XII, 2).
The A funnel of vanadium repeats the A funnel of scandium, with the
addition of _d_ 20, already studied. In the B funnel scandium B is
repeated, with an addition of _d_ 20 and a sextet for a quintet; the sextet
is the _c_ of the "nitrogen balloon." The central globe follows boron, save
that it has a septet for its centre; this was figured in iodine (p. 48).
NIOBIUM (Plate XII, 3).
Niobium only differs from yttrium by the introduction of triplets for duads
in _e_; on the meta level we have therefore triplets, and on the hyper each
triplet yields a duad and a unit. The only other difference is in the
central globe. The tetrahedra separate as usual, but liberate eight
"cigars" instead of four with four quartets; the central body is simple,
becoming three triads at the angles of a triangle on the meta level, and
three duads and three units on the hyper.
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