I have still a few remarks to add in order to show more fully the 1 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 2 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. LIII It is a strange fact that when wine that has been thus frozen is used 1 after it returns to its liquid state, it either kills or drives mad those who have drunk of it. When one inquires why this effect should be produced, the suggestion presents itself that the lightning contains a pestilential force, some taint of which probably is left in the liquid it has condensed and frozen. Indeed, the substance could never have been solidified had not some bond of cohesion been introduced. Moreover, in oil and every kind of unguent there is a foul smell after lightning has touched them. Whence it is manifest that this 2 subtle fire, driven in a direction contrary to its nature, contains a pestilential power, for not only its blow but even its mere breath is overwhelming. Moreover, wherever lightning has struck there is sure always to be a smell of sulphur, a substance which, being naturally poisonous, causes delirium if breathed too freely. But we shall return to this point when we are more at leisure. For I should like some day to prove the extent to which the world is indebted to philosophy, the parent of the arts, for knowledge of all such matters. She it was that first both investigated the causes of things and noted their effects. She performed a service far more valuable than the inspection of lightning in thus comparing results with the principles from which they are derived.