Theory of circulation by respiration : synopsis of its principles and history

In this thoughtful essay the writer traces the birth of a bold hypothesis: that the warmth we generate comes directly from the act of breathing, and that this heat drives the circulation of blood. Drawing on a chilly walk up a hill and careful self‑observation, she argues that oxygen is burned in the lungs, producing caloric energy that expands the blood and pushes it toward the heart. The narrative blends personal reflection with early chemistry, recalling Lavoisier’s ideas that had been set aside by English scientists.

She recounts the collaborative experiments she performed with a leading physician of her day, whose support helped transform her private insights into a public theory. The work also situates the idea within the pressing health crises of the 1830s, using the cholera epidemic to illustrate how a failure to understand respiratory heat could exacerbate disease. Readers are offered a window into the lively scientific debates of the era, as well as the author's own determination to defend a concept that challenged conventional medical teachings.