Reprint of Two Tracts 1

The first tract is dedicated to the Worshipful Company of Surgeons in

London, and is dated November 1775. As the type is broken the day of the

month cannot be read with certainty in the copy from which this was

reprinted: there is no other known copy to which reference can be made.

The date is either the 21st or 24th: as regards the month and the year

there is no doubt. The second tract has an address to the Royal Society,

and is dated January 1st, 1776: as Marat returned to Paris in 1777 both

these works were issued towards the end of his residence in London