ut 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
the culture broths is one siphon per 706 cubic feet. In such a case the
_modus operandi_ is as follows: In the middle of the room is placed a
vessel, which is connected with the exterior by means a rubber tube that
passes through a hole in the door. After the door has been closed, it is
only necessary to place the nozzle of the siphon in the rubber tube, and
to press upon the lever of the siphon valve, to cause the liquid to pass
from the siphon to the interior of the vessel. The evaporation of the
liquid sulphurous acid proceeds very rapidly in the free air. This
process is an exceedingly convenient one; it does away with danger from
fire, and it leaves the gildings and metallic objects that chance to be
in the room absolutely intact. Finally, the acid's power of penetration
appears to be still greater than that which is obtained by the combustion
of sulphur. It has but one drawback, and that is its high price. Each
siphon is sold to the public at the price of one dollar. To
municipalities using sulphurous acid in this form the price would be
reduced to just one-half that figure.

It will be seen, then, that for a room of 3,530 cubic feet capacity the
cost would be $5.00 or $2.50.

The combustion of sulphide of carbon furnishes an abundance of sulphurous
acid, but has hitherto been attended with danger. This, however, has
recently b