‘Prinos-verticillatus, 209 
spiritous menstruums. From one drachm to three, of the powdered 
bark, may be administered in the course of twenty-four hours. An 
ounce of the bark, added to a pint and an half of water, and boiled 
down to a pint, will make a useful decoction, which may be taken 
in the dose of a gill every two hours. “A saturated tincture is a con- 
venient and useful way of extracting the virtues of the plant ; and 
this tincture may be made by mixing the bark and berries together, 
and letting them digest for-a few days. 
It may be. proper to caution those’who gather’the Prinos or 
Black-Alder, for medical use, against mistaking for ‘it the Candle- 
Alder, or Swamp-Alder, which names are applied to a species of a 
very different genus, the Betula serratula. The name Black-Alder’ 
may lead to-a further mistake, since it is appropriated also to an- 
other species of Prinos, the P. ambiguus, and to the Tex delicula- 
ta of Barton (Hex Canadensis). It is not improbable, however, that 
other species of Prinos, besides that under notice, will be found pos- 
sessed of similar medical virtues. This it would be important to” 
inquire into. 
