Air 



211 



quite touch the bottom of the jar.) It will be found 

 that the phosphorus continues burning for some 

 time. 



Thus, although the air left in the jar will not keep a 

 candle burning, a piece of phosphorus still . remains 

 alight. Evidently phosphorus is a more vigorous com- 

 bustible than are the constituents of an ordinary candle. 



B 



Fig. 65. 



Phosphorus, in fact, burns more vigorously in air than 

 any other substance with which we are acquainted, and 

 it is for that reason that we use it in our next experiment, 

 in which we endeavour to find out whether all the air 

 takes part in the burning. 



143. EXPERIMENT 79. Fill the circular earthen- 

 ware dish, D (Fig. 65), half full of water. Carefully 



142 



