When two elements form more than one compound, as is the case with oxygen and carbon, he assigned to the compound which he thought the more complex an atom made up of two atoms of the one element and one atom of the other; the diagram for carbonic acid illustrates this, and an extension of the same plan enabled him to represent any compound, however complex its structure.
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.
The history of the Roman commonwealth illustrates this perhaps better than any other.'
On the 25th of February 1571 he was raised to the peerage as Baron Burghley of Burghley 1 (or Burleigh); the fact that he continued to act as secretary after his elevation illustrates the growing importance of that office, which under his son became a secretaryship of state.
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.