[ 4§7 ] 
from a large quantity of common fait, part of which 
arofe to the top of the lixivium in fmall grains, and 
was thence fkimmed off, and part of it fubfided 
therein in larger grains. The lixivium , when thus 
purified, and reduced to. a proper ftrength by gentle 
boiling, was fuffered to fhoot into fmall cryftals in 
proper vefiels, and the liquor that remained (which 
was a folution of the fame fait, mixed with a con- 
fiderable quantity of the muriatic calcarious and 
fome common fait) was poured from it. 
N° 6. Large cryftals of depurated Epfom fait, 
which fhot out from a fully faturated folution of this 
fait (N° 5.) made by pouring boiling water thereon, 
and fufFering it to ftand till cold. 
N° 7. More regular cryftals of the fame fait. 
N° 8. Bitter fait well purified, which I extracted 
from the marine bittern of the Salterns near White- 
haven, in which common fait is feparated from fea 
water by codtion. 
The bitter fait, purified in this manner, is an ex- 
cellent remedy in many difeafes, and may be pre- 
pared at the Britifh Salterns, for foreign as well 
as for home confumption, fo as to be afforded 
at a very moderate price, I therefore heartily re- 
commend it to be kept in the fhops in this purified 
ftate, inftead of the common Epfom fait now every 
where fold ; which laft, on account of its great im- 
purities, is delervedly grown into difrepuie. 
N° 9. A fait which I extracted from the fame 
marine bittern (N° 8.). Its cryftals are very lin- 
gular, being of a rhomboid and cuneiform fhape, 
and are very confident in common air. Their tafte 
feerns more bitter than that of the common bitter fait. 
N° 10. 
