A YEAE IN SCIENCE 21 



tiny flame point of the Bunsen flame upon a small 

 area of the bulb near the top where the diameter is 

 greatest. As the glass softens, the pressure of the air 



Fig. 4. 



outside will make a hole. Weigh the bulb after the 

 hole has been made in the glass. 



Observations : 



Weight of empty bulb 



Weight of bulb filled with air 



Difference equals weight of air in bulb 



CHAPTER II 



CONSTITUTION OF MATTER 



Exercise 4. Diffusion of Liquids. 

 Object: To determine whether liquids will diffuse 

 when in contact. 



