128 NATUBE-STUJDY LESSONS. 



10. In which seeds did the seed-coat emerge above the 

 surface ? 



1 1. (a) In which seeds do the cotyledons appear above 



the ground ? 



(i) How do the common bean and the pea com- 

 pare in this respect ? 



(c) Discover the reason for this difference. 



12. ((z) Observe carefully the general appearance of 



the cotyledons in the bean, pea, and squash 

 as growth continues. 



{i>) What change is taking place ? 



(c) From this what would you infer to be the func- 

 tion of these cotyledons ? 



13. (a) Observe the corn and castor-bean under similar 



conditions to discover what is the use of 

 the albumen in the corn seed and in the 

 castor-bean seed. 



{d) What has become of the caulicle in each of 

 the seeds? 



14. In what manner has the plumule developed ? 



15. From these observations infer the function of the 

 caulicle ; also of the plumule. 



16. How do the cotyledons emerge from the coat in 

 the case of the squash, bean, radish and castor-bean ? 



17. Compare the cotyledons of the different seeds 

 with their plumule-leaves ; also with their fully-developed 

 foliage-leaves as to size and shape. 



18. In which direction does the plumule of each seed 

 develop ? 



19. In which direction does the caulicle develop? 



