MARINE (S’A LT. 28q 
virtue confifls in correéting the peccant matter in the fto- 
mach and inteftinal canal. 
All the difeafes in which I have given it, had a putrid 
tendency. I fhall be happy to hear of its fuccefs in your 
weftern hemifphere. 
And am, wid efteem, 
SIR, 
Your moft humble carats 
WILLIAM WRIGHT. 
N° XXXVII.. 
Medical Hiftory of the Cortex Ruber, or Red Bark ; com- 
municated to JOHN MorGan, M. D. Profeffor of the 
Theory and Practice of Phyfic at Philadelphia, and 
F. R. S. London, &e.. 
note «HAVE lately received the following commu- 
nications upon the Cortex Ruber, which I have 
found fo efficacious in the cure of obftinate remittent and. 
bilious fevers, that I think it my duty to lay them_before 
this fociety, in hopes of fo valuable a medicine being 
thereby better known, and introduced more generally in-- 
to: practice. 
Extract of a Letter from Thomas S. Duché, dated Lon- 
don, Auguft 9, 1783. 
*< T was lately at a leGture delivered at Guy’s hofpital, 
by Dr. Saunders, upon the cure of intermittent fevers, 
and obferving the doétor fpoke very much in favour of 
a new {pecies of bark which he had introduced into the 
practice of phytic, I procured a fpecimen of it for you, 
thinking 
