SWIETENIA MAHAGONI. ORD, XXXVIII. Trihilate. 623 
and from numerous experiments which he made from its bark, 
he draws the following conclusions:* 
1. “ The active parts of the bark of Swietenia febrifuga are 
much more solubile than those of Peruvian bark, particularly in 
watery menstruums.” 
2. “ That it contains a much larger proportion of active (bitter 
and astringent) powers than Peruvian bark.” 
3. “ The watery preparations of this bark remain good much 
longer than similar preparations of Peruvian bark.” 
4, ‘ The spirituous and watery preparations bear being mixed 
in any proportion without decomposition.” 
5. That this bark in powder, and its preparations, are much 
more antiseptic than Peruvian bark, or similar preparations of it.” 
He adds, “ From the evident qualities of this new bark, and 
from the successful experience I have had of it in intermittent 
fevers, &c. I have every reason to imagine it will prove equal, 
if not superior, to the Peruvian bark for every purpose where that 
medicine is used. : . 
Having before given an account of #sculus Hippocastanum, or 
Horse-chesnut, the only remaining plant referred to the Materia 
Medica in the order Trihilate is the Trapa natans, called in the 
Pharmacopeeias Tribulus aquaticus, or Nux aquatica (floating 
water caltrops.) Its fruit or nut is of a quadrangular form, and 
contains.a farinaceous kernel, which was formerly in—estimation 
for its supposed -astrimgent-qualtties. SS 
© See “‘a botanical description of a new species of Swictenia, (Mahogany) with 
experiments and observations on the bark thereof, addressed to the Honourable 
the Court of Directors of the United East India Company, by William Roxburgh.” 
