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 



