Soaring prices for crude oil, falling production surpluses, wild speculation in commodities, a rush into the precious metals, turmoil in the Middle East, assertive oil producers: it is 1973-74 all over again, and at dictation speed.

Suicidal violence is not the exclusive property of the Muslim world. Suicide bombings were a tactic of nationalist struggles in 19th-century Europe and Russia, the far east during the second world war and the Vietnam war, and in modern Sri Lanka.

When William the Conqueror commissioned a great survey of his English realm at Gloucester in 1085, the result was a work so thorough, fair, dispassionate, and wide-ranging that it seemed to the succeeding generations to have come from another world.

We read too much Shakespeare at school, and view our parliamentary politics as dynastic drama, in which an impatient crown prince frets at his long subordination and begins to scheme for the throne he knows he merits, was promised and has earned.

Bulls don't read. Bears read financial history. As markets fall to bits, the bears dust off the Dutch tulip mania of 1637, the Banque Royale of 1719-20, the railway speculation of the 1840s, the great crash of 1929.

The use of refined petroleum as fuel, which began in the 1850s, freed hundreds of millions of people from the toil of centuries, gave hundreds of millions more a life of ease and plenty, and, by allowing great cities to feed themselves from every corner of the world, multiplied the population of the earth fivefold.

There are signs that the age of petroleum has passed its zenith. Adjusted for inflation, a barrel of crude oil now sells for three times its long-run average. The large western oil companies, which cartellised the industry for much of the 20th century, are now selling more oil than they find, and are thus in the throes of liquidation.