Structure of the Lungs
Diagram showing the structure of the lungs. At d is the left lung, and at c are represented the main branch of the windpipe that go to the right lung, separated by the lung itself. At the lower part, at e, are represented the very minute branches as they go to the air-cells (alveoli). At b is the windpipe (trachea), and at a is the larynx (or Adam's apple). It is through a chink in this that air passes in and out as we breathe.
Hooker, Worthington First Book in Physiology For the Use of Schools and Families (New York: Sheldon and Company, 1867) 56
Courtesy the private collection of Roy Winkelman