Its heart consists of a globe containing seven
atoms, which assume on the proto level the prismatic form shown in cadmium,
magnesium and selenium. This globe is the centre of two crosses, the arms
of which show respectively three-atomed and two-atomed groups. Round this
sphere are arranged, as on radii, twenty-four segments, each containing
five bodies--four quintets and a septet--and six loose atoms, which float
horizontally across the mouth of the segment; the whole sphere has thus a
kind of surface of atoms. On the proto level these six atoms in each
segment gather together and form a "cigar." In the rush of the streams
presently to be described one of these atoms is occasionally torn away, but
is generally, if not always, replaced by the capture of another which is
flung into the vacated space.
Each of the four funnels opens, as usual, on one face of the tetrahedron,
and they resemble the funnels of strontium and molybdenum but contain three
pillars instead of four (Plate XXIII). They stand within the funnel as
though at the angles of a triangle, not side by side. The contained bodies,
though numerous, contain forms which are all familiar.
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