2o8 On the Operation of Medicines. 



grains of the Balfam of Tolu adminiftered ^o 

 him thrice every day ; and his urine is ftrongly 

 fcented, even by this fmall quantity. Fuller 

 alTerts of the Balfam of Copaiba, Urinam odore 

 violaceo minime inficit j illam vera Japore amaro 

 imbuit. Garlick affefts the breath, though ap- 

 plied only around the wrifts. The milk of a 

 nurfe is, likewife, eafily tainted with it. A pur- 

 gative given to one who fuckles will fometimes 

 produce no operation on her bowels, if fhe be 

 coftive, but a powerful one on the child at her 

 bread. — But a ftill more convincing proof that 

 there may be a renovation of the original qua- 

 lities of a body, after it has undergone the pro- 

 cefs of digeftion, and other fubfequent changes, 

 is deducible from thefe fadsj that butter is 

 often impregnated with the tafte and fmell of cer- 

 tain vegetables, on which the cows have pafturedj 

 that the milk of fuch cows difcovers no difagree- 

 able flavour J neither does the whey nor cheefe pre- 

 pared from it. Now butter is formed firft by a 

 fpontaneous feparation of cream ; and fecondly by 

 a fermentation of it, that is, by a twofold and 

 fucceflive new arrangement of its elementary parts. 

 By thefe changes, the original offenfive materials 

 in the food of the cow feem to reaffume their 

 proper form and nature. 



After vensefeftion the ferum of the blood has 

 fometimes appeared as white as milk, whilft the 

 craflamentum retained its natural colour. This 



whitenefs 



