25. Solids, liquids and gases. 



a. Characteristics. 



b. Heat the cause of the difference. 



Experiment 24. Melting and vaporizing. 



26. The way a thermometer is marked. 



Experiment 25. The freezing point and 

 the boiling point. 



27. All things do not have a melting temperature. 



Experiment 26. The melting of waxes ; 

 glass bending. 



28. Evaporation. 



a. Requires heat. 



Experiment 27. Freezing by the evapo- 

 ration of ether. 



b. The value of perspiration. 



29. Other uses of evaporation. 



a. Cooling of food. 



b. Distillation. 



Experiment 29. The distillation of wa- 

 ter. 



c. Steam causes pressure. (See Section 94.) 



30. Kindling temperature. (See Section 95.) 



Experiment 30. "Setting fire" without 



flame. 

 21. Slow combustion. 



a. Rusting, decay damp leaves. 



b. Animal heat. 



Experiment 31. To find the temperature 



of the body. 

 32. Spontaneous combustion. 



a. The danger from oily rags. 



Experiment 32. Spontaneous combus- 

 tion of oily rags. 



