Seeds and Their Germination. 15 



EXERCISE 8. 



What are the beans in your jar doing? Make drawings 

 to show the most interesting facts. Look ont for the 

 answers to the following questions from day to day : What 

 part of the caulicle of the common bean grows most ? of the 

 scarlet runner ? Does the caulicle above the side roots of 

 the bean grow ? Does the caulicle between the upper and 

 lower side roots grow? What would be the result if that 

 part grew in a bean which had been planted ? Does the 

 caulicle above the side roots in the scarlet runner grow ? 

 Which plumule stem grows most ? Is the growth of a 

 caulicle up ? or down ? or both ? or neither ? 



Look at the drawing of a coffee seed on this page. Is 

 the caulicle sticking out of any of your coffee 

 grains ? Cut carefully so as to show the small 

 embryo. Describe the endosperm.* 



Examine a morning-glory seed. Is there a Fig. 11. Grain 

 ielly-like endosperm ? How are the cotyledons show the u em- 



bryo a at one 



folded ? If possible separate the cotyledons end - 



and spread them out. Examine the sprouting squash 



seeds. 



Put ten or more grains each of corn and wheat in water, f 



* The remainder of the coffee seeds should be planted in a box or pot and 

 kept well watered. Some of them may grow. 



t You can make an interesting garden by tying a piece of netting an old 

 reil over a goblet or jelly-glass full of water. Place on the netting a few grains 

 of wheat and corn. They will grow and show you clearly what becomes of the 

 endosperm. 



