FLUORINE (Plate IV, 3, and Plate XVII, 1) is a most peculiar looking object
like a projectile, and gives one the impression of being ready to shoot off
on the smallest provocation. The eight spikes, reversed funnels, coming to
a point, are probably responsible for this warlike appearance. The
remainder of the body is occupied by two "balloons."

FLUORINE: 8 spikes of 15 atoms 120
2 balloons 220
----
Total 340
----
Atomic weight 18.90
Number weight 340/18 18.88
MANGANESE (Plate XVII, 2) has fourteen spikes radiating from a central
"balloon."

MANGANESE: 14 spikes of 63 atoms 882
Central balloon 110
----
Total 992
----
Atomic weight 54.57
Number weight 992/18 55.11
* * * * *

IX.

We have now to consider the breaking up of the octahedral groups, and more
and more, as we proceed, do we find that the most complicated arrangements