THIRD GRADE SPRING WORK 173 



What plants live two years and then die? Make a list 

 and collect samples of such. How large do they grow the 

 first year ? When do they bear their seeds ? What prepara- 

 tion do they make for bearing seed? How does man make 

 use of this habit? What change usually takes place in the 

 plant while the seeds are developing ? Account for it. Study 

 some common root crops of biennials, as the carrot, beet, 

 turnip, etc. 



What plants live many years? Make a list. Describe the 

 elaborate preparations they make to withstand the winter. 

 Most of them do not bear seeds for several years while they 

 are developing large and strong woody roots and trunks and 

 branches, and protecting them by a thick bark coat. Con- 

 sider also thq preparations they make for each succeeding 

 winter, developing anew buds and leaves and blossoms each 

 year. 



How does man take advantage of the habits of perennials 

 to provide for his welfare ? 



LESSON XLVI 



THE SUGAR BEET 



If the school is near a sugar-beet farm or a sugar factory, 

 a special study should be made of this industry. A visit to the 

 farm or factory, or both, would form the best foundation for 

 the work. Let the children describe the planting of the 

 seeds and the machines used in doing it. Call attention to 

 the care taken to secure good seed and to avoid wasting any 

 in planting. 



The seeder places the seeds in the best position to grow, so 

 that as many as possible of those planted will develop. Con- 

 sider the slope and direction of the rows and how they may 



