SILICON: 8 funnels of 65 atoms 520 Atomic weight 28.18 Number weight 520/18 28.88 GERMANIUM (Plate XVI, 2) shows the eight funnels, containing each four segments (XVI, 4), within which are three ovoids and a "cigar." In this case the funnels radiate from a central globe, formed of two intersecting tetrahedra, with "cigars" at each point enclosing a four-atomed globe. GERMANIUM: 8 funnels of 156 atoms 1248 Central globe 52 ---- Total 1300 ---- Atomic weight 71.93 Number weight 1300/18 72.22 TIN (Plate XVI, 3) repeats the funnel of germanium, and the central globe we met with in titanium, of five intersecting tetrahedra, carrying twenty "cigars"; the latter, however, omits the eight-atomed centre of the globe that was found in titanium, and hence has one hundred and twenty atoms therein instead of one hundred and twenty-eight. Tin, to make room for the necessary increase of atoms, adopts the system of spikes, which we met with in zinc (see Plate IX, 2); these spikes, like the funnels, radiate from the central globe, but are only six in number. The twenty-one-atomed cone at the head of the spike we have already seen in silver, and we shall again find it in iridium and platinum; the pillars are new in detail though not in principle, the contained globes yielding a series of a triplet, quintet, sextet, septet, sextet, quintet, triplet. TIN: 8 funnels of 156 atoms 1248 6 spikes of 126 " 756 Central globe 120 ---- Total 2124 ---- Atomic weight 118.10 Number weight 2124/18 118.00 V.--THE BARS GROUPS. [Illustration: PLATE XVII.]