46 QUESTIONS AND ANSWERS 



too long, an application of dilute ammonia will re- 

 move the spots. 



What precautions are necessary in handling sul- 

 phuric acid? 



1. All vessels containing acid should be plainly 

 marked. 



2. It should be kept in tightly stoppered glass 

 bottles. 



3. Tables, sinks, drains, and pipes which come- 

 in contact with acid should be covered with lead. 



4. In mixing, always add the acid to the other 

 liquid — not the liquid to the acid. 



5. In measuring or pouring, keep acid away from 

 the face. 



6. If a bottle breaks in the centrifuge, flush the 

 machine with plenty of cold water. 



7 If acid is spilled it should be cleaned up with 

 a cloth immediately and the spot covered with a 

 strong alkali. 



8. If acid is spilled on the flesh, wash it off im- 

 mediately with cold water and apply lime water 

 or some dilute alkali. 



9. Refuse material containing acid should be 

 disposed of where it will not come in contact with 

 valuable vegetation, animals, or persons. 



What kinds of milk may be tested with the Bab- 

 cock test? 

 All kinds from which a fair sample may be 

 secured. 



Can a person who has had no chemical training use 

 a Babcock test? 



