Central tetrahedra 120

----
Total 360
----
Atomic weight 19.90
Number weight 360/18 20.00
META-NEON (Plate XX, 3 and 6) differs from its comrade by the insertion of
an additional atom in each of the groups included in the second body within
its arm, and substituting a seven-atomed group for one of the triplets in
neon.

META-NEON: Six arms of 47 atoms 282
Central tetrahedra 120
----
Total 402
----
Atomic weight ----
Number weight 402/18 22.33
ARGON (Plate XX, 4, 6 and 7) shows within its arms the _b_ 63 which we met
in nitrogen, yttrium, vanadium and niobium, but not the "balloon," which we
shall find with it in krypton and its congeners.

ARGON: Six arms of 99 atoms 594
Central tetrahedra 120
----
Total 714
----
Atomic weight 39.60
Number weight 714/18 39.66