178 BACTERIOLOGY. 
of lime should be put in the vessel to receive the expec- 
toration. 
15. Elevated and Surface Cars, Ferry-boats, and Public 
Conveyances. The floors, door-handles, railings, and 
all parts touched by the hands of passengers should be 
washed frequently with the hot soapsuds solution. Slat- 
mats from cars, etc., should be cleaned by scrubbing 
with a stiff brush in the hot soapsuds solution. 
Use of Bromine Solution as a Deodorant. Slaughter- 
houses, butchers’ ice-boxes and wagons, trenches, excava- 
tions, stable floors, manure-vaults, dead animals, offal, 
offal docks, etc., may be deodorized by a weak solution 
of bromine, which is a valuable agent for this purpose. 
The bromine solution, however, is only temporary in 
its action, and must be used repeatedly. It should be 
applied by sprinkling. Although somewhat corrosive 
in its action on metals, it is otherwise harmless. 
The solution of bromine must be prepared with great 
care, as the pure bromine from which it is made is dan- 
gerous. It is very caustic when brought in contact with 
the skin; it is volatile and its fumes are very irritating 
when inhaled. To prepare the solution an ounce bottle 
of liquid bromine is dropped into three gallons of water, 
and broken under the water and thoroughly stirred. 
The Practical Employment of Formaldehyde and Sulphur 
Dioxide Gases in the surface disinfection of rooms and the 
disinfection of goods which would be injured by heat. 
Formaldehyde gas has so recently come into use, and is 
for many purposes so valuable, that the description of 
methods employed to generate and use it will be given 
in detail. 
If we consider now the practical application of 
formaldehyde gas for purposes of disinfection we find 
