A boom in the production and export of cotton made Iran the richest region of the Islamic caliphate in the ninth and tenth centuries. Yet in the eleventh century, Iran's impressive agricultural economy entered a steep decline, bringing the country's primacy to an end.

Richard W. Bulliet advances several provocative theses to explain these hitherto unrecognized historical events. According to Bulliet, the boom in cotton production directly paralleled the spread of Islam, and Iran's agricultural decline stemmed from a significant cooling of the climate that lasted for over a century. The...

A boom in the production and export of cotton made Iran the richest region of the Islamic caliphate in the ninth and tenth centuries. Yet in the eleventh century, Iran's impressive agricultural economy entered a steep decline, bringing the country's primacy to an end.

Richard W. Bulliet advances several provocative theses to explain these hitherto unrecognized historical events. According to Bulliet, the boom in cotton production directly paralleled the spread of Islam, and Iran's agricultural decline stemmed from a significant cooling of the climate that lasted for over a century. The...

In this book, Richard W. Bulliet focuses on three major phases in the evolution of the wheel and their relationship to the needs and ambitions of human society. He begins in 4000 B.C.E. with the first wheels affixed to axles. He then follows with the innovation of wheels turning independently on their axles and concludes five thousand years later with the caster, a single rotating and pivoting wheel.

Bulliet's most interesting finding is that a simple desire to move things from place to place did not drive the wheel's development. If that were the case, the wheel could have been invented...