4331 
MEMOIR 
VIRTUES AND USES OF THE ROOT 
OF 
THE PLANT cattep YALLHOY, 
IN PERU. 
BY DON HIPPOLITO RUIZ, 
ed oh BOTANIST TO HIS MAJESTY IN THE BRLEDITION, TO PERU, 
&e. Ke. Ke. 
_ PRELIMINARY NOTICE. 
Tus imnptitnde of the remedies commonly applied to the cure of 
dysenteries, and the powerful antidote discovered in the root 
of the plant called Yallhoy for these severe disorders, encouraged 
me to write the present Memoir, with the object of publishing it 
for the general good. For the fulfilment of my wish, I presented 
it to the Royal Medical Academy of Madrid, in order that this 
learned body might examine it with their wonted critical atten- 
tion, and, if it incited their approbation, might insert it in the 
second volume of their Transactions. The Academy, after order- 
ing some experiments to be made, approved it, and permitted it 
to be incerperated in that volume, with other Memoirs intended 
