42 Mr. Henry on the Prejervaticn 
About the time I publifhed my method of pre- 
ferving water, at fea, from putrefaction, &c. * 
a Gentleman, who had obtained a quantity of lea 
water, for the purpofe of bathing a child, com* 
plained to me that it foon became putrid, and re- 
quefted that I would think of fome expedient to 
preferve it. 
The principal falts contained in fea water are, 
jft. common marine or culinary fait, compounded 
of foffil alkali and marine acid j adly. a fait 
formed by the union of the fame acid with magne- 
fian earth and laftly, afmall quantity of felenite. 
The quantity of faline matter contained in a pint 
of fea water, in the Britifh feas, is according to 
Neuman, about one ounce in each pint, j- When 
this water is (lowly evaporated, the common fait 
firft cryftallizes, and the marine magnefian fait 
js left in, what is called, the bittern, from which, 
* An account of a method of preferving water, at fea, 
from putrefaction, and of reltoring to the water its original 
purity and pleafantnefs, by a cheap and eafy procefs, &c. 
London, 1781. 
f In Sir Torbern Bergman’s analyfis of fea water taken 
up, in the beginning of June 1776, about the latitude of 
the’ Canaries, from the depth of fixty fathoms, the folicj 
contents of a pint of the water were 
Of common fait 
Salited magnefia 
Pypfum 
Total 
33°t 
5 3 Grs. 
1 o r 9 . 
by 
