$2 ^ Treatise 
Jlruum ; and, laflly, that thefe Infufions and De- 
co&ions are ftronger or weaker in Proportion to 
their Foulnefs or Clearnefs, or as they are more or 
lefs loaded with the fine Particles of the Medi- 
cine. Moreover we muft obferve, notwithftanding 
fome are of a contrary Opinion, that Clyfters made 
of the Bark ought to be ftrained •, fince a large 
Quantity of the Powder, fuppofe four or five 
Ounces a Day, being thrown into the Inteftines, 
produces Coftivenefs, Obftrudtions of the Bowels* 
and Inflammations, which fometimes terminate in 
Impoflhumes. 
In whatever Manner this Febrifuge is given, it 
ought to be repeated every third or fourth Hour ; 
but fuppofing always that due Preparatives have 
been ufed. For in fimple intermitting Fevers, as 
a tertian or quartan, we are to examine, in the firft 
Place, if there be any Indication either to open a 
Vein or to purge * and accordingly, on the Days 
of Intermiffion, the Patient muft be prepared by 
Blood-letting or purging. Blood-letting, in par- 
ticular, ought to be performed with a liberal Hand, 
and to be repeated according to Neceffity, before 
the Bark is given ; for then it exerts its Efficacy 
fooner and with greater Safety. Indeed, if the Blood- 
Veffels be not iufficiently evacuated, we Ihall find 
it extremely difficult to fubdue a ftubborn Fever 
with the Bark. Perhaps the Difeafe, after a tedi- 
ous Repetition of the Febrifuge, may feem at 
length to be deftroyed *, yet the Patient recovers no 
Strength, and foon after fuffers a Relapfe, unlefs 
more Blood be drawn away, which being done 
during the Ufe of the Medicine, the Fever is im- 
mediately extinguilhed, and the Strength of the 
Patient returns in a ffiort Time. Reafon itfelf 
points out this Method of Pra&ice : For the Bark 
expands and rarefies the Blood, as we may obferve 
