Maxwell illustrates the difference between a soft solid and a hard liquid by a jelly and a block of pitch; also by the experiment of supporting a candle and a stick of sealingwax; after a considerable time the sealing-wax will be found bent and so is a fluid, but the candle remains straight as a solid.
Ireland illustrates the same fact.
The history of the Roman commonwealth illustrates this perhaps better than any other.'
It illustrates Marino Sanuto's Secreta fidelium crucis, in which its author vainly appeals to Christendom to undertake another crusade.
Even so small an area as that of Britain illustrates what has already been pointed out, that the species of a flora change both with latitude and altitude.