OXYGEN: Positive snake
{ 55 spheres of 2 atoms }
{ + 5 disks of 7 atoms } 145
Negative snake " 145
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Total 290
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Atomic weight 15.87
Number weight 290/18 16.11
CHROMIUM (Plate VIII, 5) "reverts to the ancestral type," the tetrahedron;
the funnel is widened by the arrangement of its contents, three spheres
forming its first ring, as compared with the units in beryllium and
calcium, and the pairs in strontium and molybdenum. Two of these spheres
are identical in their contents--two quintets (7 _f_), a quintet (7 _j_),
and two quintets (7 _e_), _e_ and _f_ being to each other as object and
image. The remaining sphere (7 _b_) is identical with the highest in the
calcium funnel. The remaining two spheres, one below the other, are
identical with the corresponding two spheres in calcium. The central globe,
as regards its external segments, is again identical with that of calcium,
but in the internal segments a six-atomed triangle (7 _k_) is substituted
for the calcium four-atomed one (7 _e_).

CHROMIUM: 4 funnels of 210 atoms 840
Central globe 96
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Total 936
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Atomic weight 51.74
Number weight 936/18 52.00
MOLYBDENUM (Plate VIII, 6) very closely resembles strontium, differing from