f 38 ) 



iiated with the faline matter, and therefore it wili 

 be worfe. 



If a fmall quantity of fair of tartar were added 

 to the water, it would readily precipitate both the 

 loofe lime-flone, and likewife that which is united 

 to the acids. Ten or fifteen grains would gene- 

 rally be enough for a pint 5 but the exadl propor- 

 tion would readily be found, by continuing to 

 add to it, by little and little, till it ceafcd to oc- 

 cafion white clouds. This is an eafy way, not 

 only of freeing the water from its lime-ftonc, but 

 alfo of changing the faline part into nitre and fal 

 fylvii, both of which we know, by long experi- 

 ence, to be innocent. 



But the beft way of avoiding the bad effefls of 

 pump water would be, not to make a conflant 

 ufe of it ; and in a place fo well fupplied with 

 river water as London, there is very little necef- 

 fity to drink of the fprings, which in fo large a 

 city, befides their natural contents, mufl coUedb 

 many additional impurities from cellars, burying- 

 .grounds, common-fewers, and many other offen- 

 'five places, with which they undoubtedly often 



com- 



