BOOK III. CHAP. VIII. 851 



Impregnated with the acrimony, or ftrength of the quick lime. Where 

 diftillcd water CJiinot conveniently be had, rain water, freed by filtra- 

 tion of its impurities, may, with equal efficacy, be fubllituted in its 

 room. 



Different kinds of quick lime are found to impregnate water with 

 different degrees of ftrength ; but a diverfity in the menjlruum in which 

 it is diffolved, appears alfo to vary it confiderably. In order therefore 

 to procure what is of the fitteft quality for the boiling-houfe, it is full 

 as necefliiry to be careful in the choice of water, as of the lime-ftone. 

 In Jamaica it is ufual to throw a quantity of quick lime into privies, 

 that are grown offenfive, in order to fweeten them ; which purpofe it 

 very fpeedily and moft effeftually anfwers, by abforbing probably the 

 mephitic particles. In Madeira it is thrown on the corpfes buried in 

 church, to accelei'ate their diffolution, and prevent noxious effluvia. 



254. Free Stone. 

 255. Agats. 



I have occafionally fpoken of their varieties generally remarked here *, 



256. Refining Clay. 



257. Potters Clay. 

 258. Pipe Clay. 



The firfl: is ufcd in claying Mufcovado fugars, as well as for a bet- 

 ter fort of earthen ware, manufactured by the Negroes. 



The fecond is more frequent, and fupplies the inhabitants with wa- 

 ter jars, and other convenient veffels for domeftic ufe. It is likewife 

 moft proper for tiles, and drips. 



The third fort is common to many parts, or at leaft a fpecies of it. 

 In Sixteen-mile-walk, the foil in general is a reddifh clay, upon dig- 

 ging into which a fmall depth are found detached veins of a white clay, 

 refembling that from which tobacco pipes are made ; it bears the fire 

 well, and might doubtlefs anfwer in manufacture. 



259. Aboo Earth. 



This is chiefly found in marley beds, running in veins of various co- 

 lours, but generally anfwering to that of furrouniiiij; l.iyeri : it is 



* Vol. II. p. 66. 



5 Q 2 apparently 



