150 DISINFECTION AND STERILIZATION 



In addition to the above-discussed disinfectants a large 

 number of substances, particularly organic, are used in 

 medicine, surgery, dentistry, etc., as more or less strong 

 antiseptics, and the list is a constantly lengthening one. 



In the laboratory chloroform, H2O2, ether and other vola- 

 tile or easily decomposable substances have been used to 

 sterilize liquids which could not be treated by heat or by 

 filtration. The agent is removed either by slow evapora- 

 tion or by exhausting the fluid with an air pump. The 

 method is not very satisfactory, nor is absolute steriliza- 

 tion easily accomplished. It is much better to secure such 

 liquids aseptically where possible. 



