CHLORINE: Upper part {12 funnels of 25 atoms 300 {Central globe 10 Lower part same 310 Connecting rod 19 ---- Total 639 ---- Atomic weight 35.473 Number weight 639/18 35.50 (The Atomic Weights are mostly from Erdmann, and the Number Weights are those ascertained by us by counting the atoms as described on p. 349, January, and dividing by 18. Prof. T.W. Richards, in _Nature_, July 18, 1907, gives 35.473.) BROMINE (Plate V, 3).--In bromine, each funnel has three additional bodies, ovoid in shape, an addition of 33 atoms being thus made without any disturbance of form; two pairs of atoms are added to the central globe, and a rearrangement of the atoms is effected by drawing together and lessening the swing of the pair of triplets, thus making symmetrical room for the newcomers. The connecting rod remains unchanged. The total number of atoms is thus raised from the 639 of chlorine to 1439. Over and over again, in these investigations, were we reminded of Tyndall's fascinating description of crystal building, and his fancy of the tiny, ingenious builders busied therein. Truly are there such builders, and the ingenuity and effectiveness of their devices are delightful to see.[20] BROMINE: Upper part {12 funnels of 58 atoms 696 {Central globe 14 Lower part same 710 Connecting rod 19 ---- Total 1439 ---- Atomic weight 79.953 Number weight 1459/18 79.944 IODINE (Plate V, 4).--We find herein that the central globe gains 4 atoms, the two pairs becoming 2 quartets; the connecting rod exactly reproduces the rods of chlorine and bromine; the funnel is also that of bromine, except that five bodies, containing 35 atoms, are added to it. The 1439 atoms of bromine are thus raised to 2887.