MEMOIR 
ON THE e 
GENUINE CALAGUALA, 
AND TWO OTHER ROOTS, 
WHICH ARE SENT UNDER THE SAME NAME FROM SOUTH AMERICA. 
BY DON HIPPOLITO RUIZ, | 
FIRST BOTANIST TO HIS MAJESTY IN THE EXPEDITION TO PERU, 
Xe, i Se. ite, 
PRELIMINARY NOTICE. 
Ar the repeated request of several professors of the three — 
branches of medicine, both in Spain and in foreign states, for 
copies of the Memoir on the Genuine Calaguala which I inserted 
in the first volume of the Transactions of the Royal Medical 
Academy of Madrid, together with that on the Ratanhia, Can- 
chalagua, and China Peruwviana, 1 have been encouraged to re- 
print it in a separate form. I have added some illustrations, 
and an accurate engraving from the original drawing, for the 
more complete description of a vegetable hitherto not sufficiently 
known to naturalists, and for which reason there have been and 
are current-in commerce many roots of different cryptogameus 
plants of little or no virtue, to the disparagement of the effiea- 
ns 
