224 CHEMISTRY OF FARM PRACTICE 



in tablet form mixed with ammonium chloride (NH^Cl), 

 which facilitates its solubility. It is used in the proportions 

 of 1 to 500 or 1 to 1000. It combines with albuminous sub- 

 stances and is rendered inert. This material is a powerful 

 germicide, but it is a deadly poison. 



All disinfectants are selected because of their chemical 

 activity, and care should be exercised in handling them 

 because of their poisonous nature. The remnants after use 

 should be destroyed rather than stored. 



