hich I wish to refer to-day.

In my essay describing the model city, Hygeiopolis, it was suggested
that in every town there should be a building like a gas house, in
which ozone should be made and stored, and from which it should be
dispensed to every street or house at pleasure. This suggestion was
made as the final result of observations which had been going on since
I first began to work at the subject in 1852. It occurred to me from
the moment when I first made ozone by Schonbein's method, that the
value of it in a hygienic point of view was incalculable.

To my then young and enthusiastic mind it seemed that in ozone we had
a means of stopping all putrefaction, of destroying all infectious
substances, and of actually commanding and destroying the causes which
produced the great spreading diseases; and, although increase of years
and greater experience have toned down the enthusiasm, I still believe
that here one of the most useful fields for investigation remains
almost unexplored.

In my first experiments I subjected decomposing blood to ozone, and
found that the products of decomposition were instantly destroyed, and
that the fluid was rendered odorless and sweet. I discovered that the
red corpuscles of fresh blood decomposed ozone, and that coagulated
blood underwent a degree of solution through its action. I put dead
birds and pieces of animal substances that had undergone extreme
decomposition into atmospheres containing ozone, and observed the
rapidity with which the products of decomposition were neutralized and
rendered harmless. I employed ozone medicinally, by having it inhaled
by persons who were suffering from foetor of the breath, and with
remarkable success, and I began to employ it and have employed it ever
since (that is to say, for thirty-seven years), for purposes of
disinfection and deodorization, in close rooms, closets, and the like.
I should have used it much more largely but for one circumstance,
namely, the almost impracticable difficulty of making it with
sufficient ease and in sufficient quantities to meet the necessities
of sanitary practice. We are often obstructed in this way. We know of
something exceedingly useful, but we cannot utilize it. This was the
case with ozone. I hope now that difficulty is overcome. If it is, we
shall start from this day on a new era in regard to ozone as an
instrument of sanitation.

As we have seen, ozone was originally made by charging dry oxygen or