n8 Dr. Henry’s Analysis of several Varieties 
Though I purposely refrain from giving the details of the 
several analyses, which were made according to the foregoing 
plan, from the conviction that they would be both tedious and 
unnecessary, yet there are a few circumstances, which it may 
be proper to mention more fully, than can be done in the 
form of a table. 
1. The brine which I examined was from Northwich, and 
was sent to me in the state in which it was taken from the 
spring.* At the temperature of 56° Fahrenheit, it had the 
specific gravity of 1205. It was perfectly limpid, but lost a 
little of its transparency when raised to a boiling heat, in con- 
sequence of the deposition of a very minute quantity of car- 
bonate of lime, and oxide of iron. It was immediately pre- 
cipitated by muriate of barytes, oxalate of ammonia, and 
alkaline solutions, both mild and caustic. Eight ounce mea- 
sures, evaporated to dryness in a sand heat, gave 1230 grains 
of salt, which, for the sake of distinction, I term entire salt. It 
proved, on analysis, to contain in one thousand parts ,-f* 
base in the several varieties of muriate of soda. They may readily be estimated from 
the proportion, deduced by Dr. Marcet, of 46 acid, and 54 soda, in looofthe pure 
muriate. In this determination he assumes, that 100 parts of luna cornea, after being 
melted and heated to redness, consist of 19 05 parts of acid, to 80.95 oxide of silver. 
This statement agrees very nearly with the recent one of Gay Lussac, who makes 
100 parts of silver to combine with 7.60 oxygene, and this oxide to neutralize 25.71 
parts of real muriatic acid. 
* I have lately been informed that this brine had been pumped out of a rock-salt 
mine, into which, from the impossibility of obtaining the salt in a solid form, it was 
allowed to flow. Hence it was fully saturated with muriate of soda. 
f The specific gravity and proportion of earthy sulphates in Cheshire brine 
appears to differ considerably in the brine of different springs. See Holland’s 
Cheshire Report, p. 45, &c. 
