76 A YEAR IN SCIENCE 



dangers of poisoning resulting from the common friction 

 match, its manufacture should be forbidden. 



Questions 



1. What is the chief source of phosphorus? 



2. How is it prepared? 



3. What are the two different kinds of phosphorus? 



4. What are some of the more prominent char- 

 acteristics of each? 



5. Why should yellow phosphorus be kept under 

 water? Why should it never be touched with the 

 hands? 



6. What are the chief uses of phosphorus? 



7. Write an essay on the match industry. 



8. Why do some countries forbid the manufacture 

 of friction matches? 



