for use, and as no battery is required
nor anything more than the turning of a handle, any person can work
it.

2. It can be readily moved about from one part of a room or ward to
another part.

3. If required for the sick it can be wheeled near the bedside and, by
a tube, the ozone it emits can be brought into action in any way
desired by the physician.

I refer in the above to the minor uses of ozone by this method, but I
should add that it admits of application on a much grander scale. It
would now be quite easy in any public institution to have a room in
which a large compound Wimshurst could be worked with a gas engine,
and from which, with the additional apparatus named, ozone could be
distributed at pleasure into any part of the building. On a still
larger scale ozone could be supplied to towns by this method, as
suggested in Hygeiopolis, the model city.

It will occur, I doubt not, to the learned president of this section,
and to others of our common profession, that care will have to be
taken in the application of ozone that it be used with discretion.
This is true. It has been observed in regard to diseases, that in the
presence of some diseases ozone is absent in the atmosphere, but that
with other diseases ozone is present in abundance. During epidemics of
cholera, ozone is at a minimum. During other epidemics, like
influenza, it has been at a maximum. In our paper Dr. Moffatt and I
classified diseases under both conditions, and the difference must
never be forgotten, since in some diseases we might by the use of
ozone do mischief instead of good. Moreover, as my published
experiments have shown, prolonged inhalation of ozone produces
headache, coryza, soreness of the eyes, soreness of the throat,
general malaise, and all the symptoms of severe influenza cold.
Warm-blooded animals, also, exposed to it in full charge, suffer from
congestion of the lungs, which may prove rapidly fatal. With care,
however, these dangers are easily avoided, the point of practice being
never to charge the air with ozone too abundantly or too long.

A simple test affords good evidence as to presence of ozone. If into
twenty ounces of water there be put one ounce of starch and forty
grains of potassium iodide, and the whole be boiled together, a starch
will be made which can be used as a test for ozone. If ozone be passed
through this starch the potassium is oxidized, and the iodine, set
free, strikes a blue color with the s