other member of the negative and positive groups; the third, ascending, is a very slight modification of the other thirds; the fourth is a union and re-arrangement of the fourth and fifth; the fifth, of four ovoids, adds one to the three ovoids of bromine, iodine and silver; the triangular group is like that in copper and silver, though with 28 atoms instead of 10 or 21, and it may be noted that the cone in iron has also 28.  The central body in the ovoid is very complicated, and is shown in c, the bodies on each side, d, are each made up of two tetrahedra, one with four six-atomed prisms at its angles, and the other with four spheres, a pair with four atoms and a pair with three.  We then come to the connecting rod.  One of the four similar groups in the centre is enlarged in a, and one of the sixteen circling groups is enlarged in b.  These groups are arranged in two planes inclined to one another.

GOLD:  Upper part
          { 12 funnels of 97 atoms 1164
          { Central ovoid {c 101
                          {2 d, 38 76
      Lower part same 1341
      Connecting rod { 4 a 84 336
                     {16 b 33 528
                                        ——­
                      Total 3546
                                        ——­
      Atomic weight 195.74
      Number weight 3546/18 197
It may be noted that the connecting rod is made up of exactly sixteen atoms
of occultum, and that sixteen such atoms contain 864 ultimate atoms, the
exact member of atoms in titanium.

* * * * *

III.

Occultum was observed by us in 1895, and, finding that it was so light, and so simple in its composition, we thought that it might be helium, of which we were unable, at the time, to obtain a sample.  When, however, helium itself came under observation in 1907, it proved to be quite different from the object before observed, so we dubbed the unrecognised object Occultum, until orthodox science shall find it and label it in proper fashion.

OCCULTUM (Plate VI, 1).

We here meet the tetrahedron for the first time, with each angle occupied by a six-atomed group, the atoms arranged as on the end triangles of a prism.  This form recurs very often, and was noted, last month, as seen in copper (Plate VI, 3); it revolves with extreme rapidity around its longitudinal axis, and looks like a pencil sharpened at both ends, or a cigar tapering at both ends; we habitually spoke of it as “the cigar.”  It appears to be strongly coherent, for, as will be seen below, its six atoms remain attached to each other as meta-compounds and even when divided into two triplets as hyper-compounds, they revolve round each other.