30 



Name two substances into, which the wood was separated 

 by heat. 



(c) Fill a strong test tube one third full of fine soft coal 

 and connect with the bottle as above. Heat the tube and 



FIG. 23. Destructive distillation. 



as before test the gas escaping from the exit tube C. What 

 gas is formed from the destructive distillation of soft coal ? 

 After the tube has cooled examine its contents. What re- 

 mains of the coal ? Name two substances into which soft 

 coal was separated by heat. 



