happens. It weakens the blood vessels so that they easily
rupture, which causes apoplexy, paralysis and death. Calcareous
concretions in the kidneys and bladder, also, come from the same
cause, and are called gravel. Such deposits are not only
annoying and painful to the patient, but in time may prove fatal
if not removed by surgery.

Middle-aged and elderly people should never drink anything but
soft water. If a natural supply of soft water cannot be obtained
distilled water should be substituted. If neither natural soft
water nor distilled water are available, and there is doubt as to
the purity of the water that is being used, it should be boiled
and then let stand to cool and settle. Boiling not only destroys
and renders harmless any organic germs that may be present, but
also precipitates and eliminates much of its inorganic salts.

A few drops of a weak solution of nitrate of silver added to a
glass of water will quickly determine its quality. If the water
that is being tested is free from mineral matter no change is
produced, but if it contains mineral it turns the water opaque or
milky.

The value of mineral water as a healthful or necessary drink has
been greatly exaggerated. While it may do good in some
instances, it is not nearly as beneficial as is commonly
supposed. Instead of it always doing good the contrary is often
true.

If a mineral water is desired there is no necessity of visiting a
mineral spring to obtain it, as it can be made artificially at