Patrick Browne thanks Linnaeus for the letter of 15 April 1771 [this letter has not come down to us] but says that another letter mentioned by Linnaeus never reached him. The short treatises that Browne mentioned in his latest letter are not yet printed, so Browne cannot send them.
In the interim, however, Browne gives a detailed description of his cure of the pox by mercury combined with herbal substances. Recipes for the pills themselves and rules for their usage are provided.
Browne returns to some botanical issues and admits that many of his doubts were due to the fact that he had not had sufficient literature at hand. However, he specifies some remaining issues where he does not agree with Linnaeus.
Browne encloses some specimens that he does not know what to make of. He gives some additional information.
The letter ends with another presentation of the small works that Browne is intending to have printed. They are based on his experience and observations in the island of Montserrat.