The general appearance of Copper Sulphate is as in the diagram of Sulphuric Acid. As in Sulphuric Acid, the fourth group which completes the tetrahedron in each case is not shown. The tetrahedral form is indicated, but this is not intended to represent an actual boundary. Fig. 175.

In the tetrahedron there appears a grand centre. In the middle of this centre is a body of five Anu from the central bar of the Copper atom. Round these five there radiate to the four corners of a tetrahedron the four groups Ad6, from the two globes of Copper. Then, pointing to the faces of the tetrahedron, appear four balls of four Anu. These four balls come also from the two globes of Copper. The whole centre-piece acts as a unit though not enclosed in a sphere wall

There remain the two bodies of three Anu and two groups of four Anu from the bar of Copper. These are at the corners of the tetrahedron but have a peculiar motion like that of a fly round the corners of the tetrahedron, first one corner and then the next, waltzing round by themselves. The observer wonders whether they are not somehow trying to get back to the others, but cannot An experiment was tried of releasing the whole thing, and it was then found that these groups jumped back into their places in the bar with great avidity.

From this centre radiate the Oxygen atoms through the four faces of the tetrahedron, and at the end of each Oxygen atom is a funnel of Sulphur, as in Sulphuric Acid. Round each funnel of Sulphur are placed six funnels of Copper, in two groups of three, all pointing to the centre.

It will be seen that allowing for the fourth group which is not shown in the diagram, all the constituents of the elements in the compound are accounted for.

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