it only in the composition of the highest pair of spheres in the funnels
and in the presence of a little sphere, containing two atoms only, in the
middle of the central globe. The topmost spheres contain no less than eight
subsidiary spheres within each; the highest of these (7 _e_) has four atoms
in it; the next three have four, seven and four (7 _e_ _g_ _e_),
respectively; the next three are all septets (7 _g_), and the last has
four--making in all for these two spheres 88 atoms, as against the 48 in
corresponding spheres of strontium, making a difference of 160 in the four
funnels.

MOLYBDENUM: 4 funnels of 408 atoms 1632
Central globe 98
-----
Total 1730
-----
Atomic weight 95.26
Number weight 1730/18 96.11
II a.--This group contains magnesium, zinc, cadmium, and mercury, with an
empty disk between cadmium and mercury; we did not examine mercury. All are
diatomic, diamagnetic and positive; the corresponding group consists of
sulphur, selenium and tellurium, also all diatomic and diamagnetic, but
negative. The same characteristics of four funnels opening on the faces of
a tetrahedron are found in all, but magnesium and sulphur have no central
globe, and in cadmium and tellurium the globe has become a cross.

[Illustration: PLATE IX.]

MAGNESIUM (Plate IX, 1) introduces us to a new arrangement: each group of
three ovoids forms a ring, and the three rings are within a funnel; at
first glance, there are three bodies in the funnel; on examination each of