A Letter to a Friend

A Letter to a Friend (written 1656; published posthumously in 1690), by Sir Thomas Browne, the 17th century philosopher and physician, is a medical treatise of case-histories and witty speculations upon the human condition.
Morgellons.
It is believed to be the source of a term Mary Leitao found in 2001 to describe her son's skin condition. She chose the name "Morgellons disease" from a skin condition described by Browne in "Letter to a Friend", thus:
There is, however, no suggestion that the symptoms described by Browne are linked to the alleged modern cases of Morgellons.
In 1935, Charles Ernest Kellett MD FRCP (1903-1978), who lectured in the history of medicine at the University of Newcastle medical school, wrote a detailed criticism of Browne's Morgellons reference.