{ left 27 CARBON: One pair of funnels { right 22 { centre 1 -- 54 4 pairs of funnels of 54 atoms 216 Atomic weight 11.91 Number weight 216/18 12.00 TITANIUM (Plate III, 6, and XV, 2) has a complete carbon atom distributed over the ends of its four arms, a pair of funnels with their linking atom being seen in each. Then, in each arm, comes the elaborate body shown as 3 _c_, with its eighty-eight atoms. A ring of twelve ovoids (3 _d_) each holding within itself fourteen atoms, distributed among three contained globes--two quartets and a sextet--is a new device for crowding in material. Lastly comes the central body (4 _e_) of five intersecting tetrahedra, with a "cigar" at each of their twenty points--of which only fifteen can be shown in the diagram--and a ring of seven atoms round an eighth, that forms the minute centre of the whole. Into this elaborate body one hundred and twenty-eight atoms are built. TITANIUM: One carbon atom 216 4 _c_ of 88 atoms 352 12 _d_ of 14 " 168 Central globe 128 ---- Total 864 ---- Atomic weight 47.74 Number weight 864/18 48.00 ZIRCONIUM (Plate XV, 3) has exactly the same outline as titanium, the carbon atom is similarly distributed, and the central body is identical. Only in 5 _c_ and _d_ do we find a difference on comparing them with 4 _c_ and d. The _c_ ovoid in zirconium shows no less than fifteen secondary globes within the five contained in the ovoid, and these, in turn, contain altogether sixty-nine smaller spheres, with two hundred and twelve atoms within them, arranged in pairs, triplets, quartets, quintets, a sextet and septets. Finally, the ovoids of the ring are also made more elaborate, showing thirty-six atoms instead of fourteen. In this way the clever builders have piled up in zirconium no less than 1624 atoms. ZIRCONIUM: One Carbon atom 216 4 _c_ of 212 atoms 848 12 _d_ of 36 " 432 Central globe 128 ---- Total 1624 ---- Atomic weight 89.85 Number weight 90.22 [Illustration: PLATE XVI.] SILICON (Plate XVI, 1) is at the head of the group which corresponds to carbon on the opposite turn of the lemniscate. It has the usual eight funnels, containing four ovoids in a circle, and a truncated "cigar" but no central body of any kind. All the funnels are alike.