[Illustration: TEPID WATER DOUCHE]

To our knowledge, the only apparatus in this line that has been devised
was exhibited last year at the exhibition of hygiene in the Loban
barracks. It has been used daily for six years in several garrisons, and
therefore has the sanction of practice.

This apparatus, which is due to Mr. Herbet, consists of a steam boiler
and of an ejector fixed to a reservoir of water and provided with a
rubber tube to which a nozzle is attached. The steam generated in the
boiler passes into the ejector, sucks up the water and forces it out in
a tepid state.

The apparatus thus established did not sufficiently fulfill the purpose
for which it was designed. It was necessary to have a means of varying
the temperature of the water projected, according to the season and
temperature of the air, to have an instantaneous and simple method of
regulating the apparatus, that could be understood by any operator, and
to have the apparatus under the control of the person holding the
nozzle. These difficulties have been solved very simply by causing the
orifice of the nozzle to vary. This nozzle, from whence the jet escapes,
is formed of rings that screw together. When the nozzle is entire, the
jet escapes at a temperature of say 40°. When the first ring is
unscrewed, the water will make its exit at a temperature of 38°. In
order to lower the temperature still further, it is only necessary to
unscrew the other rings in succession, until the desired temperature has
been obtained.

As it is, the apparatus is rendering great services where it has been
introduced; for example, at Besancon and Belfort. It serves, in fact,