This book investigates the historical and scientific evolution of nitrogen fixation as the primary driver for human agricultural productivity and the development of settled civilizations. G. J. Leigh, a chemist, utilizes his technical background to bridge the gap between molecular science and human history. He argues that the mastery of soil fertility was the fundamental prerequisite for the transition from nomadic existence to the establishment of permanent urban centers and complex societies.

Experts recognize this work as a clear, accessible synthesis of chemical history for a general audience. Readers frequently note that the prose balances technical scientific concepts with historical narrative effectively, making it a useful resource for those interested in the intersection of science and human development.