130 Eupatorium perfoliatum. 
imbricate and hirsutulous; scales lanceolate, acute. Florets about 
twelve or fourteen. Each flower tubulous, divided into five segments 
or teeth, as represented in Fig. 3. Anthers deep blue or black, fila- 
ments five, united with a fistulous brace. Seeds prismatic, attenuate 
at the base, of a crow-black colour, and situated on a naked receptacle. 
Pappus or down of the seed pilose ; hairs scabrous. The flowers are 
fully expanded in the month of August, and the plant is every where 
found in bloom during the autumn, and even as late as the last of Oc- 
tober. 
CHEMICAL PROPERTIES, 
We are indebted to Dr. Andrew Anderson, for an excellent che- 
mical analysis of this species of Eupatorium. According to his expe- 
riments, it appears, that it contains first : a free acid—secondly, tannin 
in small quantity—thirdly, a bitter extractive matter—fourthly, a gum- 
my matter—fifthly, a resin—sixthly, azote—seventhly, lime, proba- 
bly the acetate of lime; eighthly, gallic acid, probably modified ; 
ninthly, a resiniform matter soluble in water and alcohol, which 
seems to contain a bitter principle. 
The medicinal properties of bone-set are fully given out, both to 
aqueous and spirituous menstrua. Proof spirit digested on the leaves 
and flowers, make a fine preparation for cases which will bear the 
spirit. 
