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106
advantage Carbon Bisulphide has over the "candle"
is that, with the amounts usually used, the former is
completely volatilised in about twenty (20) minutes,
whereas the candle requires some two (2) hours or
more. The disadvantages of the bisulphide are that it
is an explosive liquid, that there is always the risk of
breaking the bottles containing it in the course of
transport, and that copper pans, which are heavy and
expensive, are necessary. The fumes from the carbon
bisulphide are peculiarly unpleasant and persistent, in
both respects more so than those from the candle.
When cake sulphur is used, 1 lb. of sulphur
is allowed for every 1,000 cubic feet, or fraction
of that quantity, of air space to be fumigated.
If carbon bisulphide be used, a trifle over one
pint is used as the equivalent of 1 lb. of
sulphur. Theoretically, about 8 fluid ounces of the
bisulphide should give as much S02 in the gaseous
form as 1 lb. of sulphur. The general instruction is
in all cases to use an excess of the standard rather
than err in the direction of false economy. In the
point of expense, there is very little difference between
the two materials.
Hitherto it has not been the practice of the
Department to require re-papering of the walls, whitewashing
of the ceilings, or re-painting of the woodwork
of the room, unlets the state of the room as
regards dirt and dilapidation be such as would favour
the harbouring of disease germs under conditions