128 NATURE STUDY : BY GRADES 



Discuss the drying of clothes and of fruit, and perform 

 some simple experiments to show how heat influences, in a 

 general way, evaporation under various conditions. 



Note the temperature when it storms. -How is it affected 

 by rain? by wind? by snow? Is it ever very warm when 

 it snows? Is it ever very cold when it rains? What effect 

 would heat have upon falling snowflakes? What effect 

 would cold have upon falling raindrops? 



Note the temperature when the first frosts come. What 

 plants are most injured by the early frosts? Discuss tender 

 and hardy plants, and notice how the frost-bitten leaves of 

 the former look. Discuss at proper times the effects of 

 frosts, and the changes that plants undergo as the tempera- 

 ture gets lower in the fall. Do plants protect themselves 

 in any way from the frost? How does the farmer protect 

 his crops of fruits and vegetables from the frosts? Discuss 

 fruit cellars, potato pits, etc. Are dry crops like wheat, 

 corn, etc., injured by cold? Why not? 



Much valuable number work may be given in connection 

 with the study of temperature. Average and compare tem- 

 peratures of weeks and months, and cultivate the children's 

 judgment of the temperature of air and water, by practice. 



LESSON IV 

 DEW 



In keeping the record of the temperature, make frequent 

 comparisons of weekly averages, and note the rate of change. 

 Also call attention to the effect of these changes upon ani- 

 mal and plant life, so that the pupils may see the relations 

 between the changes in temperature and other changes 

 about them. 



