NITROGEN: Balloon 110 Oval 63 2 bodies of 20 atoms 40 2 " " 24 " 48 ---- Total 261 ---- Atomic weight 14.01 Number weight 261/18 14.50 VANADIUM (Plate XII, 2) closely follows scandium, having two types of funnels. Funnel A only differs from that of scandium by having a globe (see 4 _d_) inserted in the ring of four ovoids; funnel B has a six-atomed, instead of a five-atomed globe at the top, and slips a third globe containing twenty atoms (see 4 _d_) between the two identical with those of scandium (see 4 _c_). The central globe has seven atoms in its middle body instead of four. In this way does vanadium succeed in overtopping scandium by 126 atoms. VANADIUM: 3 funnels (A) of 160 atoms 480 3 " (B) " 137 " 411 Central globe 27 ---- Total 918 ---- Atomic weight 50.84 Number weight 918/18 51.00 NIOBIUM (Plate XII, 3) is as closely related to yttrium as is vanadium to scandium. The little globes that scamper round the "cigars" contain twelve atoms instead of eight (see 4 _e_). The rest of the funnel is the same. In the central globe both the tetrahedra have "cigars," and a central nine-atomed globe spins round in the centre (see 4 _f_), seventeen atoms being thus added. NIOBIUM: 6 funnels of 277 atoms 1662 Central globe 57 ---- Total 1719 ---- Atomic weight 93.25 Number weight 1719/18 95.50 III a.--Aluminium, gallium and indium were examined from this group. They are triatomic, diamagnetic, and positive. The corresponding group contains phosphorus, arsenic and antimony: bismuth also belongs to it, but was not examined; they are triatomic, diamagnetic and negative. They have no central globes. [Illustration: PLATE XIII.] ALUMINIUM (Plate XIII, 1), the head of the group, is, as usual, simple. There are six similar funnels, each containing eight ovoids, below which is a globe.