LII
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I have still a few remarks to add in order to show more fully the force of lightning in various ways, for its power is not always displayed in just the same way in every kind of material. For instance, the stronger bodies are shattered with greater violence on account of their resistance; it sometimes passes through the yielding ones without doing any damage. With stone and iron and all the hard substances it enters into conflict, because in its impetuous course it must find a way through them; so it makes a way by which to escape. The more flexible and thinner substances, though they seem very suitable material for flames, it spares, mitigating its fury when it encounters no obstacle to its passage. And so, as I said at a previous point, coin is found fused, while the purse that contained it is untouched; the extremely thin fire runs through the invisible interstices of the latter. But whatever solidity it meets in a beam it subdues as being refractory. For, as I have just said, its fury does not always take the same form; the nature of the force in each case is revealed merely by the kind of the damage, and you can tell the species of the lightning by its effect. Again, the force of the same flash produces many varieties of damage in the same material. For example, in a tree it scorches any portion that is very dry; what is firm and hard it bores through and smashes; the outer bark it scatters, the inner layers nearer the centre it bursts and cuts up, the leaves it lashes and strips off. Wine is frozen, iron and copper fused.