Ill 
of British and Foreign Salt. 
(B. c.) By direct experiments I had learned that 100 grains 
of muriate of magnesia, when thus decomposed by carbonate 
of ammonia, conjoined with phosphate of soda, give 151 grains 
of an insoluble ammoniaco-magnesian phosphate dried at about 
. 
go 0 of Fahrenheit. Hence it was easy, from the weight of 
the precipitate, to calculate how much of the former salt was 
contained in the mixture of muriate of lime and muriate of 
magnesia. Thus, if 20 grains of a mixture of the two muriates 
yielded 15.1 of ammoniaco-magnesian phosphate, it is obvious 
that the mixture must have consisted of equal weights of 
muriate of lime and muriate of magnesia. 
(B. d.) The estimation of the proportion of muriate of lime, 
in a mixture of this salt with muriate of magnesia, was some- 
times performed in a different way. To a cold solution of a 
known weight of the two salts, super-oxalate of potash was 
added ; and the precipitate was collected, washed, and dried 
at about 160 0 Fahrenheit. Of this precipitate I had previously 
found that 116 grains are formed by the decomposition of 
100 grains of dry muriate of lime. From the quantity of ox- 
alate of lime it was easy, therefore, to infer that of the 
muriate, from whose decomposition it resulted ; and this sub- 
tracted from the weight of the two salts, gave the weight of 
the muriate of magnesia. 
II. To separate and estimate the earthy Sulphates. 
(C.) The portion of salt which had resisted the action of 
alcohol, was dissolved by long boiling in sixteen ounce mea- 
sures of distilled water, and the solution was filtered. On the 
filtre a small quantity of undissolved matter generally re- 
mained, which was washed with hot water, till it ceased to 
