Click each image for a close-up.
Text from the seminal 1809 work of cardiology Cases of the Organic Disease of the Heart, with Dissections and Some Remarks Intended to Point Out the Distinctive Symptoms of These Diseases, by John Collins Warren. In this work, Warren describes the symptoms of 11 of his patients with heart disease as they presented in his office and, later, on his dissecting table.
Text from Chromosome 1 of the human genome.
Text from Zoonomia, the 1794 masterpiece of Erasmus Darwin (grandfather of Charles), in which he attempted to catalog and explain human anatomy, pathology, and physiology, including the visual system.
Text from the The Sceptical Chymist by Robert Boyle (1661), in which he provided the foundations of modern chemistry by proving that matter is comprised of individual atoms.