The group is made up, not of single chemical elements, as in all
other cases, but of sub-groups, each containing three elements, and the
relations within each sub-group are very close; moreover the weights only
differ by two atoms per bar, making a weight difference of twenty-eight in
the whole. Thus we have per bar:--
Iron 72 Palladium 136
Nickel 74 Osmium 245
Cobalt 76 Iridium 247
Ruthenium 132 Platinum A 249
Rhodium 134 Platinum B 257
It will be noticed (Plate XVII, 3, 4, 5,) that each bar has two sections,
and that the three lower sections in iron, cobalt and nickel are identical;
in the upper sections, iron has a cone of twenty-eight atoms, while cobalt
and nickel have each three ovoids, and of these the middle ones alone
differ, and that only in their upper globes, this globe being four-atomed
in cobalt and six-atomed in nickel.
The long ovoids within each bar revolve round the central axis of the bar,
remaining parallel with it, while each spins on its own axis; the iron cone
spins round as though impaled on the axis.
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