THIRD GRADE SPRING WORK 177 



Distance Apart. Which seeds are commonly planted 

 broadcast ? Why ? What are the size and habits of growth 

 of these plants? Mention some that are planted close to- 

 gether, but in rows some distance apart. Discuss the method 

 as adapted to the nature of the plant, the care it requires, and 

 convenience in gathering the crop. 



Mention some seeds that are planted in hills close together 

 and some in hills wide apart. Give reasons in each case. 



NOTE. Usually tall, slim plants, with few or no branches, like the 

 grasses, are planted close together. Corn does better in hills, so that it 

 can be cultivated both ways, but requires more space than the grasses 

 and small grains; while the gourd family have widely spreading vines 

 that need much ground space. 



LESSON L 

 PLANTS NEED HEAT 



In what month do plants begin to grow? Why? When 

 do they cease to grow? Why? Compare from your tem- 

 perature record the average temperature of November and 

 April. Compare the plants on the north side of the house 

 with those on the south side in early spring. Account for 

 the difference in size or development. 



Where is vegetation earliest and most luxuriant, in lower 

 valleys, upper valleys, or on high mountains? Compare the 

 temperatures of these places. Where does the snow last 

 longest? Account for the vegetation in the different zones 

 as influenced by the temperature. 



Tn which month do our trees and most other plants make 

 the greatest growth? Measure growing twigs during the 

 summer months and determine this from actual observation, 

 and test. 



NAT. STUDY 12 



