F. (164 deg. C.), and
then a considerable quantity of nitrate of ammonium, a crystallised
salt, is thrown into the water, in which it dissolves. Strange to say,
although the water alone would boil at 212 deg. F., a strong solution in
water of the ammonium nitrate only boils at 327 deg. F., so that the effect
of dissolving that salt in the water is the same as if the pressure were
raised to seven atmospheres. Now let us, as hat manufacturers, learn a
practical lesson from this fact. We have observed that wool and fur
fibres are injured by boiling in pure water, and the heat has much to do
with this damage; but if the boiling take place in bichrome liquors or
similar solutions, that boiling will, according to the strength of the
solution in dissolved matters, take place at a temperature more or less
elevated above the boiling-point of water, and so the damage done will
be the more serious the more concentrated the liquors are, quite
independently of the nature of the substances dissolved in those
liquors.
_Solution.
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