as Obje5ls of the Art of Dying, (^c. 391 



open its pores ; would not the barilla alone be 

 more efficacious ? And for what reafon can we 

 fuppofe that the fliecp's dung, which contains a 

 quantity of foul, colouring matter, fhould be 

 added ? We have feen that in the fcouring of 

 filk, where a perfect foap is ufed, fome portion 

 of it adheres, notwithftanding the wafhing the 

 filk undergoes. The cotton is indeed alfo 

 well wafhed after this firft operation ; but it is 

 moft likely that water will not be able to remove 

 the whole fubftance of this animalifed foap. 

 And it feems alfo probable that the im- 

 perfedl foap, or mixture of oil and alkali, 

 together with the clung liquor through which 

 the cotton is {o often pafled, will continue to 

 furnifh fomewhat to it. 



For animal fubftances, contain an acid which 

 is feparated in various forms. We have already 

 feen that faccharine acid is obtainable from 

 them by means of nitrous acid ; the blood 

 affords the Pruflian acid, and alfo phofphoric 

 acid. This laft is contained ftill moj-e abun- 

 dantly in the urine and in the bones, but we 

 ihall defer the confideration of the ufe of animal 

 acid in dying till we come to treat on the fubjed 

 of bafes. 



The idea of animalizing vegetable fubftances 



to promote their attraftion for colouring matter, 



occurred to me many years fince ; and the late 



Sir Torbern Bergman feems to have held a 



C c 4 fimilar 



