SPIGELIA MARILANDICA. ORD, IX. Stellate. 81 
“dose had the same good effects. I prefer the root to the other 
parts of the plant, of which, when properly dried, I gave from 
“ twelve to sixty or seventy grains im substance.” In infusion it 
“ may be given to the quantity of‘two, three, or four drams twice 
“aday. I have found that, by keeping, the plant loses its virtue 
“in part; for forty grains of the root which has not been gathered 
“above two months, will operate as strongly as sixty Which has 
“ been kept for fifteen months.’ 
In Dr. Garden’s subsequent letters, addressed to Dr. Hope in the 
years 1764 and 1766, the efficacy of this root ‘in worm cases is 
further confirmed, and he observes, that the root keeps better than 
he at first thought, having lately used it several years old with great 
| success. In what he calls continued or remitting low worm fevers, 
| he found its efficacy promoted by the addition of rad. sepentar. virg. 
8 As this plant seems to be received ‘into the Materia Medica principally on the 
authority of Dr. Garden, we have judged it proper to give his account in his own. 
words, , : 
No, 16. 272 
i cram cinta ot 
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