⚠The manuscript page exhibits significant foxing and water staining, particularly along the left-hand margin. A faint institutional stamp is located near the top center.

A faint, oval-shaped library or archival stamp is visible at the top, containing the word "ROME" and other illegible text.

ON

THE LUNGS

LETTER

THE SECOND.

original: "De Pulmonibus Epistola Altera." In this second letter addressed to his colleague Giovanni Alfonso Borelli, Malpighi provides the first histological description of the lung tissue. Most significantly, it is in this text that he announces his discovery of the capillaries—the tiny blood vessels connecting arteries and veins—which completed the circuit of blood circulation proposed by William Harvey decades earlier.

Lungsfrom the Latin 'pulmonibus'; the organs of breathing.
Letterfrom the Latin 'epistola'; a common medium for sharing scientific discoveries in the 17th century.
anatomy, Marcello Malpighi