On Water in Crystallized Barytes, fyc. 159 
which agree sufficiently well with my experiment to show 
that the crystals contain only 10 equivalents of water, instead 
of 20 as stated by Dr. Dalton. 
According to Dr. Hope, the crystals of strontia contain 68 
per cent, of water, and Dr. Dalton concludes from this state- 
ment that they contain 12 equivalents of it. I prepared some 
crystals of strontia in the same manner as those of barytes 
above described; they were dried in a similar mode, and 
taking the mean of two experiments, which differed but very 
little, 100 parts of the crystals, after saturation with muriatic 
acid and treatment with carbonate of ammonia, give 51.57 
of carbonate of strontia ; and as 74 of this substance con- 
sist of 22 of carbonic acid and 52 base, 51.57 contain 36.24 
of strontia, which, deducted from 100, the crystals experi- 
mented upon, leave 62.76 as the quantity of water contained 
in them. The crystals are therefore evidently composed of 
1 equivalent of strontia 52, or 36.62 
10 equivalents of water 90, or 63.38 
142 
and resemble those of barytes with respect to the quantity 
of water they contain. 
.in 100. 
