greatest stimulus to my perseverance, with the same frankuess 
I haye hitherto used, and without ayailing myself of any re- 
serves, as others have done to exalt unduly their meritorious 
secrets, in preparing and giving to the public dissertations on 
other new and valuable remedies ; such as the Extract of Bark, 
made in Peru by the simple and exact method which I ex- 
plained in my Quinologia, with the barks newly cut from the! 
trees, the use of which, as well as of the bark, has been admi- 
rably diffused throughout Europe since the publication of that 
treatise; and they form at the present day two considerable 
branches of commerce, highly productive to the royal revenue: 
and to Spain: the Root and Extract of the Ratanhia, a power- 
ful styptic for restraining bloody fluxes in. eve »way they 
originate, if the medicine be opportunely administered, and in 
proper doses ;* to give firmness to the teeth, and to consolidate 
relaxations and fractures; through which efficacious virtues its. 
use is extending in all parts, and forms another branch of com- 
merce sufficiently important. The admirable remedy of the: 
root of Yallhoy against dysentery, in which disorder it ope- 
rates with singular energy, as has been proved by experiments 
in Pern, as well as in the general hospital of this city by an 
individual of this Academy, and at the Society’s expense: 
aes rey of the pet wipes under which name have been 
1 eichiiamaiiaaeaann ugh Te of skill) ith some persons in making a decoction of 
the roots of the Ratanbia, by lepriving the dose prescribed in my dissertation of its 
tive part, the medicine has sometimes ‘failed “of romadlag te gist promptly as might 
be wished. I have also observed, that some of the Faculty having prescribed the Extract 
of the Ratanhia in small quantities, and diluted in much water, it has not operated with 
the efficacy desired, especially in urgent cases; in which the dose of the Extract, well 
elaborated, must be one drachm, or the eighth of an ounce, repeated four or more times a 
day, or every hour, as practitioners administer this remedy either in powder infused or boiled 
in water, or in the form of pills, when the patient or his stomach cannot admit it in the other 
modes, 
