39 jaro. 
z20in, (spice-bush) sassafras, cascarilia bark, natmeg 
and its arillus or investing substance, mace—carda- 
mon, anise, fennel, coriander, dill and cummin 
seeds, all the species of menthze and monarda, ma- — : 
ny of which yield a camphor as narcotic as com- 
mon camphor, lavender, rosemary, marjoram, pen-— 
nyroyal, dittany, &c. &c- While on the other 
hand it must be acknowledged that ginger, cala- 
mus, Kempferia rotunda, serpentaria, contray- 
erva, ioe ome and other articles of 
infusion or tincture. In so far they appear to hold 
a middle station between the aromatics first men- 
tioned, and the simple tonics, and bitter, or bitter- 
astringent tonics: the former being profitably 
and properly resorted to through the medium of 
their essential | inous and volatile principle, _ 
while the fatter can alone de nes ate 
tain the position I have taken in these lectures. of 
the nugatory efforts at classification Surely if the 
preceding substances are all tonics, they are so by 
very diverse proximate principles, no less than by 
extremely discrepant modes of acting on the living» 
is as unsatisfactory as subversive of the very prin- | ; 
ciples of classification assumed. ‘The only rational 
Jisposition of the articles called tonics, is, Kthink, — 
system ; and any attempt to unite them in oneclass — 
