436 



REVIEW. 



the Alpine saw-mill ; in the milk-churn of the chalet ; in the sup- 

 ports of the cradle in which the mountaineer, by water-power, rocks 

 his baby to sleep. All the forms of mechanical motion here indi- 

 cated are simply the parcelling out of an amount of calorific motion 

 derived originally from the sun ; and, at each point at which the 

 mechanical motion is destroyed or diminished, it is the sun's heat 

 which is restored." TyndalL 



678. Recapitulation. 



f VISIBLE OR MECHANICAL. 

 HEAT 



INVISIBLE OR 

 MOLECULAR. 



LIGHT 



ELECTRICITY... J 



OF POSITION, e. g., Hanging Ap- 

 Potential. pie, Hedd of 

 Water. 



OF MOTION, e. g., Falling Apple, 

 Kinetic. Flowing Water. 



OF POSITION, e. g., Latent Heat. 

 Potential. 



OF MOTION, e. g., Sensible Heat. 

 Kinetic. 



OF MOTION, or 

 Kinetic. 



OF POSITION, e. g., Charged Ley- 

 Potential. den jar, Battery 



ivith circuit bro- 

 k<n. 



OF MOTION, e. g., Leydenjar dis- 

 Kinetic. charging : Bat- 



tery with cir- 

 cuit closed. 



GENEEAL KEVIEW. 



1. (a.) Define science, matter, mass, molecule and atom. (&.) How 

 do physical and chemical changes differ ? (c.) Define physics. 



2. (a.) What are chemical and physical properties of matter? 

 (ft.) Define and illustrate two universal and one characteristic 

 properties of matter. 



3. (a.) Define meter, liter and gram. (&.) What is a solid, a 

 liquid, and a gas ? (c.) Define dynamics and force. 



4. (a.) Name and define three units of force. (&.) Give Newton's 

 Laws of Motion, (c.) Give the law of reflected motion. 



