the Bead Sea and the River Jordan. 307 
This residue, on being heated with fluat of lime, instantly ran 
into a globule, ana was evidently sulphat of barytes. 
5. To another portion of the Dead Sea water, weighing 250 
grains, a solution of nitrat of silver being added till it ceased 
to produce any precipitate, a quantity of luna cornea was ob- 
tained, which after careful edulcoration and exposure to a red 
heat, weighed 163 2 grains, a quantity equivalent, according 
to the proportions above stated (§ II. 3), to 31,09 grains of 
real acid. 
6. To the remaining solution a little muriat of ammonia 
was added, in order to remove the unavoidable small excess 
of silver, and this new precipitate was separated and well 
edulcorated. 
7. The clear fluid, which had been much increased in bulk by 
these edulcorations, being concentrated to about 3 ounces, a 
strong solution of oxalat of ammonia, warm, but not nearly boil- 
ing,* was added to it, b_y which a precipitate was obtained, which 
collected and washed with the usual precautions, and after 
deducing 0,076 grains of lime -f- for the 0,1 36 grains of selenite 
belonging to 250 grains of the water, yielded 4,814 grains of 
pure lime = 4,66 grains acid = 9,48 grains muriat of lime. 
I should not omit mentioning that the method which I used 
in all my experiments to ascertain the quantity of pure lime in 
The precipitates of lime by oxalat of ammonia subside more readily if the solu- 
tions be used warm; but when concentrated and heated to the boiling point, this test 
acts also in some degree on magnesia, a circumstance which in the present instance, 
was to be particularly avoided. 
f The proportion of lime in selenite, and of acid in sulphat of barytes, are taken 
from a paper of Mr. Chenevix, in Nicholson’s Journal, Vol. II. in which they 
are stated to be 56,4 of lime in 100 parts of selenite, and 24 parts of acid in 100 parts 
of sulphat of .barytes. 
