240 A TREATISE ON THE CONNECTION OF 



the process of soap-making : a part of the caustic alkali 

 combines with the sebaceous acid of the tallow, forming 

 sebat of potash or se^)at of soda — saline matters to be 

 found, with otherneutral salts, in soap-makers spent lyes. 



So far from lime rendering dvmg more soluble, it im- 

 pedes that process, by forming with the dung insoluble salts, 

 and it otherwise injures the dung by disengaging and throw- 

 ing into the air the ammoniac or volatile alkali, that other- 

 wise would have combined, and huve formed neutral 

 soluble salts, with the phosphoric or oxalic acids of the 

 dung, or other vegetable or animal matters. The mixing 

 of hot lime with dung has been highly disapproved of in the 

 preceding part of this Work ; and the Author must now 

 conclude, by observing, that the application of it, for the 

 purpose of dissolving the imaginary oil contained in dung, 

 is too injudicious a pra(5lice, as well as, in a chemical point 

 of light, too erroneous a theory, to have been permitted 

 to pass without notice. 



ADDENDA, 



