132 



NATURE STUDY BY GRADES 



i.".i..i.'i I :.'.:::: 

 89 



LENGTH OF SHADOW BLACKBOARD 

 ILLUSTRATION 



Account for this. When is it cool ? Why ? Give examples 

 from the children's observations which illustrate the dif- 

 ference in the heat of direct and slanting rays. 



What changes take 

 place in the sun's 

 position during the 

 year? In what 

 month is the noon 

 shadow longest? 

 Where is the sun at 

 e 7 8 9 10 that time? In what 

 month is the shadow 

 shortest? Where, 

 then, is the sun? How does its heat strike the earth in 

 each case? Describe the sun's daily path in winter; in 

 summer. 



While studying the length of the noon shadow and 

 therefore the changes in the path of the sun, the teacher 

 will aid the class greatly by using graphic or objective 

 representations of their observations. At the end of each 

 week draw on the blackboard a rectangle representing 

 the shadow cast on the shadow-stick, and occasionally 

 call attention to the gradual change in length. Date or 

 number each week's shadow. 



If the pupils can at the same time observe the sun 

 rise and set, the length of the day should be determined 

 by them and may be written once a week over the week's 

 shadow representation. They will no doubt soon discover 

 a relation between the two. The changes gradually taking 

 place in the average temperature may also be noted and 

 related to the other observations. 



When do we have the longest days? When do we have 



