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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.
If a little more ammonia is added, several varieties of rhombic octahedra appear; if a little nitric acid is added, the rectangular prism appears again. The changes take place not by the addition of new crystals, but by changing the growth of the original ones." These, however, may be said to be the same species, after all; but recent researches by Dr.
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