An anatomical disquisition on the motion of the heart & blood in animals

The treatise presents systematic anatomical observations and experiments showing that blood moves in a closed circuit propelled by the heart’s rhythmic contractions, distinguishing pulmonary and systemic pathways. It challenges prevailing theories that blood is consumed or passes through invisible cardiac pores, and supports its conclusions with dissections, animal experiments, and measurements that estimate cardiac output. Emphasizing direct observation and quantitative reasoning over received authority, the work outlines methods, results, and logical arguments that establish the heart as the organ responsible for maintaining continuous circulation.