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Atoms combine to form molecules, and molecules arrange themselves in certain definite geometric forms such as cubes, tetrahedra, hexagonal prisms and stellate forms, with properties emphasized on certain faces or ends. Thus quartz will twist a ray of light in one direction or the other, depending upon the arrangement which may be known by the external form of the crystal.
Only a very small proportion of this amount is made available for the supply of cities and towns. The subject of the chemical constitution of matter was taken up by Mr. Johnstone Stoney, F. R. S., who amused and interested the chemical section by a number of drawings of tetrahedra, octahedra, etc., on to which he dexterously stuck representations of oxygen atoms, chlorine atoms, and so on.
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