so 
Great Britain,* * * § and a large proportion of the remainder from 
Spain and Portugal. Among those various foreign kinds,, 
the bay salt of the latter countries is preferred, for preserv¬ 
ing meat. It is made by spontaneous evaporation from sea 
water.f Should our foreign importation be cut off, the de¬ 
mands for domestic consumption, must principally be sup¬ 
plied, from the sea coast. The improvement of the estab¬ 
lishments there, ought to be effected by all possible means, 
and the best method of doing this, will be by a comparison 
of the various modes adopted in foreign countries. Those 
pursued in England, France, on the Mediterranean, and in 
the West-India Islands, may all be found in different writers 
on the subject4 
Sulphate of soda, or Glauber’s salts, is also a constituent ill 
sea water. It is procured from it in large quantities, so 
much so that the waters of the Mediterranean yield it nearly 
in the proportion of 155 parts of their own weight.§ This 
substance is obtained from the mother liquor or bittern, (as 
it is called,) remaining after the common salt has been 
made. At several works on the sea coast, it is manufac¬ 
tured in very large quantities, so as at present to exceed the 
demand.il Soda might however be extracted from it, were 
not that alkali altogether supplanted by potash, in this coun¬ 
try. 
Sulphate of magnesia is obtained from mineral springs, 
and in this country is not unfrequently made from sea wa¬ 
ter. It is stated to have been found native, in caves in 
Munroe county (Virginia. 
* Vide “ an analysis of several varieties of British and foreign 
e< salt, with a view to explain their fitness for different com me r- 
“ cial purposes, by William Henry, M. I). F. R. S.” in Mease’s 
Archives of Useful Knowledge, vol. 2, p. 117. 
f The mode of manufacturing bay salt is stated in Mease’s 
Archives, vol. 2, p. 345. 
^ For an account of the modes pursued in England, and 
France, vide ChaptaFs Chemistry, vol. 4, 160 et seq ; in Bavaria, 
vide Nicholson; on the .Mediterranean, and in the West-India 
Islands, vide Mease, vol. 2, p. 34>5. 
§ Chaptal’s Chemistry, vol. 4, p. 10. 
|| In 1810, 334,238 lbs. were made in Massachusetts. 
Coxe’s Medical Museum, vol. 1, p. 95. 
