The process by combustion of sulphur is the simplest and cheapest. To
effect such combustion, it suffices to place a piece of iron plate upon
the floor of the room, and on this to place bricks connected with sand,
or, what is better, to use a small refractory clay furnace (as advised by
Mr. Pasteur), of oblong form, 8 inches in width by 10 in length, and
having small apertures in the sides in order to quicken combustion.

In order to obtain a complete combustion of the flowers of sulphur, it is
necessary to see to it that the burning is effected equally over its
entire surface, this being easily brought about by moistening the sulphur
with alcohol and then setting fire to the latter. Through the use of this
process a complete and absolute combustion has been obtained of much as
from 18 to 20 grains of sulphur per cubic foot.

In the proportion of 8 grains to the cubic foot, all the different
culture broths under experiment were sterilized save the one containing
the bacteria of charbon. As for the vaccine virus, its properties were
destroyed. This economical process presents but two inconveniences, viz.,
the possibility of fire when the furnace is badly constructed, and the
alteration of such metallic objects as may be in the room. In fact, the
combustion of sulphur is attended with the projection of a few particles
of the substance, which form a layer of metallic sulphide upon copper or
iron objects.

[Illustration: FIG. 2.--CKIANDI BEY'S APPARATUS FOR BURNING CARBON
SULPHIDE.]

The use of liquid sulphurous acid in siphons does not offer the same
inconveniences. These siphons contain about one and a half pounds of
sulphurous acid. The proportion necessary to effect the sterilization of