OF SOME SALTS OF SODA. 89 
all that does belong to it; which appears hitherto 
not to have been a very easy matter; for, on 
reference to Dr. Henry’s Elements of Experi- 
mental Chemistry, vol. i, page 594, 11th Ed., we 
find this expression relative to sulphate of soda 
—‘ by exposure to the atmosphere, it effloresces, 
and loses weight; and with so much quickness 
that it is difficult to ascertain precisely its water 
of crystallization.’ 
-T have also in a similar manner examined the 
efflorescing property of the ordinary phosphate 
of soda; and, as near as I can judge, it is the 
same as that of the carbonate. 
