148 ESSAYS AND OBSERVATIONS 



worms-" After fome months an increafed 

 dofe had the lame good efiecls. I prefer 

 the root to the other parts of the plant, 

 of which, when properly dried, I give 

 from 12 to 60 or 70 grains in fubftance. 

 In infufion it may be given to the quan- 

 tity of 2, 3, or 4 drachms twice a-day. I 

 have found that, by keeping, the plant 

 lofes its virtue in part j for 40 grains of 

 the root which has not been gathered a- 

 bove two months, will operate as flrongly 

 as fixty which has been kept for fifteen 

 months. 



LETTER II. 1764. 



The longer I ufe the Indian Pink root, 

 the clearer and more evident proofs I have 

 of its excellent efFe<5ls in worm- cafes ; in 

 which it rarely fails, if the root is frefh. 



LETTER m. 1766. 



The anthelmintic virtues of the Indian 

 Pink root are daily better known, and it is 

 come into general pra^^ice both in town 



and 



