Neon was discovered in 1898 by Ramsey and Travers, and the weight given to
it was 22. This almost corresponds with our weight for meta-neon, 22.33;
the latest weight given to neon is 20, and that corresponds within
one-tenth to our weight, 19.9. From this it would seem that neon was
examined in the later investigations and meta-neon in the earlier.

He says further on a probable _fourth_ Interperiodic Group:

Thinking over the diagrams, it seemed to me likely that a fourth group
exists, coming on the paramagnetic side, directly under iron, cobalt,
nickel, just one complete swing of the pendulum after rhodium, ruthenium,
palladium. This would make four interperiodic groups, and they would come
also _periodically_ in the table too.

I took the diagram for Osmium, and in a bar postulated only three columns
for the first element of the new groups, _i.e._, one column less than in
Osmium. This would make 183 atoms in a bar; the new group then would follow
in a bar, 183, 185, 187. Here I found to my surprise that the third
postulated group would have a remarkable relation to Os, Ir, Pt.

Thus

Os.--245 (in a bar); less 60 = 185
Ir. 247 less 60 = 187
Pt. 249 less 60 = 189
But strange to say _also_

Ruthenium (bar) 132 less 60--72
Rhodium 134 less 60--74
Palladium 136 less 60--76