A YEAE IN SCIENCE 



69 



Fig. 25. 



Exercise 42. Convection. 



Object: To show a method of producing currents 

 in air and water. 



Bunsen burner 

 Wire gauze 



Cotton, dandelion, or milk- 

 weed fruits 

 King stand 



Apparatus 



Test tube 



Water 



Test tube holder 



Fine sawdust 



