This book investigates the intersection of environmental theory, medical discourse, and racial ideology in the context of British imperial expansion in India between 1600 and 1850. Mark Harrison, a historian specializing in the history of medicine and empire, utilizes archival records and colonial medical reports to argue that European perceptions of India's climate were central to the development of racial hierarchies. He demonstrates how the perceived threat of environmental degeneration influenced imperial policy, ultimately shifting the British approach from potential settlement to a model of administrative control.

Historians and scholars of colonial medicine recognize this work as a foundational text for understanding the environmental dimensions of British imperialism. Readers frequently note the academic density of the prose and the rigorous use of primary source material to support its historical claims.