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19
tions which are drained into the Thames in its course:
on the other hand it contained much less sulphuric acid,
which forms a very unpalatable and unwholesome compound
with lime, and it was less hard, in the proportion
of 12.7 to 16, and more capable of being softened
by boiling, therefore less wasteful of soap and tea, inasmuch
after boiling it retained only 4.8 degrees of "permanent
hardness," whilst the Parisian retained 9.8.