16 



LABORATORY MANUAL 



face of the water. Does the water rise to fill the tumbler ? 

 Does it rise into the tumbler at all ? Now tilt the tumbler 



sidewise so that the edge 

 of the mouth of the tumbler 

 comes just above the sur- 

 face of the water. What 

 happens? Without remov- 

 ing the tumbler, push it 

 down into the water again. 

 Does the water rise into the 

 tumbler this time? In the 

 first instance was the 

 tumbler empty ? What did 

 it contain? What do you 

 conclude concerning this 

 substance ? 



B. Put the stem end of 

 the thistle tube through 

 one of the holes of the rub- 

 ber stopper. Into the other 

 hole, insert the piece of 

 glass tubing. Place the 

 stopper in the mouth of the 

 bottle and close the upper 

 end of the glass tube by 

 means of the rubber tubing and clamp. Now pour water 

 into the bulb of the thistle tube. Does any water run 

 into the bottle ? Keep the bulb full of water. Does the 



Fig. 2. 



