6 BOTANY. 



Exercise 4. 



10. The squash (or pumpkin) seedling. Take seedlings in different 

 stages of germination which have been grown in a germinator. Make 

 sketches of several different stages, showing the expanded cotyledons, the 

 plumule between them, the main root, and the origin of the lateral roots, the 

 hypocotyl (the portion of the stem between the root and the cotyledons). 

 Note the "peg" on the hypocotyl and determine the way in which this 

 organ assists the embryo in getting out of the seed coats. Compare seed- 

 lings growing in the soil. 



11. Other seedlings. Make a similar study of the bean, pea, and corn 

 seedlings, both from seeds germinated in folds of damp paper, and from 

 those grown in the soil. Sketch the different stages, and write a full descrip- 

 tion and comparison, noting the points of agreement and disagreement 

 between them, and the different ways in which the seedlings come up from 

 the ground. 



(Consult Chapter 33). 



Material. Seeds of the pumpkin or squash, beans, peas, and corn. 

 These should be soaked in water for about twenty-four hours before they 

 are wanted for the study of the seed. 



Seedlings of the same plants in different stages of germination. Some of 

 the seeds should be germinated in folds of wet paper or in moss, and some 

 of them should be planted in soil in pots. These should be started about a 

 week in advance of the time when they are wanted for study by the student. 

 The number of seeds and seedlings which should be prepared will depend on 

 the number of students in the class. A surplus of material should be pro- 

 vided for. 



