Anatomical Mercury: Changing Understandings of Quicksilver, Blood, and the Lymphatic System, 1650-1800

'The object of sense and experiment': the ontology of sensation in William Hunter's investigation of the human gravid uterus

William Hunter's anatomical inquiry employed all of his senses, but how did his personal experiences with the cadaver become generalized scientific knowledge teachable to students and understandable by fellow practitioners? Moving beyond a historiographical focus on Hunter's images and extending Lorraine Daston's (2008) concept of an 'ontology of scientific observation' to include non-visual senses, I argue that Hunter's work aimed to create a stabilized object of the cadaver that he and his students could perceive in common. Crucial to this stabilization was the sense of touch and its interaction with other senses, creating intersensory knowledge of the cadaver. Through a close reading of his neglected posthumous publication An Anatomical Description of the Human Gravid Uterus (1794), I demonstrate that Hunter wrote extensively about touch and other sensory experiences, using comparative metaphors and other linguistic strategies to engender clear ideas of the cadaver in the mind of the reader. That these ideas could be consistent between practitioners was guaranteed by God, but required practitioners to appropriately reflect on their sensory experiences with cadavers. Hunter's experimental practice encompassed both simple and complex methods, all aimed at increasing the range of sensorial experiences he had with the gravid uterus. His preservations of these experiences in text, image and preparation could then be used to support further anatomical investigations.

The discovery of the lymphatic system in the 17th century. Part VII: the rise of vascular injection

In the second half of the seventeenth century, vascular injection was introduced in anatomy for the study of the mechanism of secretion of bodily fluids, a phenomenon into which the lymphatic system plays an important role. Injection became a routine procedure in the second half of the seventeenth century. Reinier de Graaf developed an appropriate syringe to inject liquid into minuscule tubules. He was the first to observe that water injected into seminiferous tubules was partially repelled by transudation to be absorbed by neighbouring lymph vessels. He also injected lymph vessels in and around the uterus and ovaries. His study friend Johannes Swammerdam developed a coloured hardening wax and Ruysch injected coloured hardening wax into vessels and ducts of lymph nodes and excretory glands. Ruysch introduced combined injection - corrosion procedures which resulted in delicate structures, including capillaries. He denied the presence of glandular structures in organs as described by Malpighi, and made blood vessels inclusive lymph vessels agents instead of aids to fluid secretion. His ideas resulted in the concept of the body being completely vascular, a theory which became commonplace in Dutch medical circles. Antony Nuck, the professor in medicine at the Leiden University, injected an amalgam of quicksilver and tin for further evaluation of the lymphatic system. He thought that lymph vessels originated from distal arteries and sustained that the shape of pores in these arteries determined the mechanisms of secretion in secretory glands and in lymph glands. He introduced lymphography.

The discovery of the lymphatic system in the seventeenth century. Part VI: the microscopic discovery of the subtle anatomy

The discovery of chyle and lymph vessels had furthered the dream of understanding the body's structure and functions. Initially it was thought that chyle was sucked from the intestines through the open mouths of chyle vessels, and that lymph vessels were side branches of arterial end branches. In the second half of the 17th century, microscopy became an adjuvant for research into the subtle anatomy of the lymphatic system. In the present paper, we will focus on its initial use for the study of the structure and function of chyle and lymph vessels, and lymph glands.

William Hunter and lymphatics

William Hunter along with his brother, John, and their colleagues William Hewson, William Cruikshank and John Sheldon made a large contribution to understanding of lymphatic vessels. Hewson, Cruikshank and Sheldon all carried out mercury injections and made much progress in mapping the distribution of lymphatics in the human body. William Hunter appreciated that lymphatics absorbed fluid from the tissues of the body and that lacteals of the intestine and lymphatics are similar structures. John Hunter carried out an elegant series of experiments that proved that lacteals absorb products of digestion. The Hunters, however, were wrong in dismissing absorption by blood vessels and missed the importance of blood capillaries. William Hewson showed that lymphatics were not confined to mammals but that they are present in reptiles, birds and fish. Hewson also demonstrated that tracheobronchial glands are lymph nodes and not mucus-secreting glands as previously thought. Although William Hunter appreciated that tuberculosis and venereal diseases might involve the regional lymph nodes, he does not seem to have fully grasped that malignant disease might involve the local nodes or the concept that knowledge of lymph drainage could be used to define the likely site of a primary malignancy.