112 Dairy Bacteriology. 



vessel of water, danger from fire will be avoided, and the 

 heat generated by the burning sulphur will evaporate 

 sufficient water to increase the effect of the fumes. 



Formalin. Another disinfectant that may be used as. 

 a liquid or as a gas is formalin, which is a watery solu- 

 tion of the gas, formaldehyde. It is much more power- 

 ful in its action than sulphur, and has a great advantage 

 over corrosive sublimate and other strong disinfectants 

 in that it is not so poisonous to animals as it is to bac- 

 teria and fungi. 



It can be used as a solution (one to five per cent) for 

 the washing of woodwork, or for the treatment of any 

 object, since it has no corrosive action. It can also be 

 employed as a gaseous disinfectant for the treatment of 

 rooms. It is most conveniently applied by suspending 

 large cloths in the room and spraying them with the so- 

 lution, then closing the room for a number of hours. 



Bleaching powder. Chloride of lime, or bleaching 

 powder as it is often called, is a good disinfectant, as 

 well as a deodorant. It is used as a wash in the propor- 

 tion of four to six ounces to a gallon of water. It must 

 be used with care in factories since the free chlorine that: 

 is given off has a penetrating odor. 



