39-2 
PART USED AND PREPARATION.—The fresh bark of the root is treated 
as in the preceding species. The tincture obtained is the most transparent and . 
lightest in color of all the species of Rhus here mentioned. It has a beautiful, 
clear, crimson color by transmitted light; a decidedly terebinthic odor; very astrin- 
gent taste, and strong acid reaction. 
CHEMICAL CONSTITUENTS.— Volatile Oil. This body has, when first dis- 
tilled, the disgusting odor of bed-bugs; but when treated with ether and evapo- 
rated, it acquires a pleasant aroma after having been exposed to the air for 
twenty-four hours. 
Beside the above, Mr. H. W. Harper* determined the presence of gallo- 
tannin, resin, acid resin, fixed oil, and a red coloring matter. 
DESCRIPTION OF PLATE 39. 
1. A flowering branch, from Lowmansville, N. Y., May 14th, 1884. 
2. End of late summer branch, showing the inflorescence preparing for the next season. 
3. Flower. 
4. Petal. 
5. Stamen and lobe of disk. 
6. Pistil and hypogynous disk. 
7. Dormant inflorescence, 
8. Scale of same, outer face. 
g. Scale of same, inner face. 
(3-9 enlarged.) 
* Am. Four. Phar., 1881, 212. 
