Abstract
IN LONDON, one day in 1754, a messenger bearing a note from Dr. Cohn Mackenzie, a young obstetrician, arrived at Dr. William Hunter’s famous School of Anatomy in Covent Garden. The note requested that Mr. John Hunter, younger brother and assistant of Dr. Hunter, join Dr. Mackenzie in examining a postmortem specimen of particular interest. Very little is known about Dr. Mackenzie. Like the Hunters, he came from Scotland. He studied with the famous obstetrician, William Smellie, and became a successful practitioner of midwifery in Southwark, near Guy’s Hospita1.l Mackenzie, Dr. Smellie’s assistant, possessed a good deal of scientific curiosity, was sufficiently interested in the enigma of placental circulation to want to investiRate it, and had the necessary techni-
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