ABSTRACT
Giordano Bruno consistently asserted that the blood flows rapidly in a circle. Being generous to Bruno, we might see these remarks as the first clear statement of the rapid circulation of the blood. As Bruno made them well before the work of Harvey, we might give him at least some of the credit for the discovery of the circulation. However, being less generous to Bruno, we might see his comments as nothing more than speculation employing a macrocosm-microcosm analogy, with little to do with Harvey’s scientific discovery. As we shall see, matters are not as clear cut as these positions might suggest, and the aim of this chapter is to steer a course between these two extremes. One thing Bruno and Harvey have in common is a strong reliance on a macrocosm-microcosm analogy between the human body and the earth’s weather cycle to support their views on the circulation.
