135 



like colls in the later stages are large cells separated by intercellular 

 spaces, which contain, besides starch, rather large granules which give 

 the test for proteids. 



Summary and Conclusion. 



The following conclusions result from the above observations: 



1. The order of appearance of the primordia of the floral organs is 

 sepals, stamens, carpel, petals, although the last three may appear 

 simultaneously. 



2. The energy of the plant is directed at first to the development 

 of the stamens and carpel at the expense of the petals. 



3. The archesporium becomes differentiated at a rather late stage. 



4. The tapetum divides but a limited number of times. 



5. The megaspore mother cell gives rise to the embryo sac directly. 

 G. The early development of the embryo sac is typical. 



7. The antipodals disappear at a very early stage. 



8. The embryo sac increases much in size before fertilization and 

 replaces all the tissue within the integuments. 



9. The egg cell is placed laterally to the synergids. The latter have 

 striated tips. 



10. The polar nuclei do not fuse until just before fertilization. The 

 latter is a rapid process. 



11. The ovule is at first anatropous, later campylotropous. 



12. The fertilized egg does not divide until there are several endo- 

 sperm nuclei in the embryo sac. 



13. In the three-celled proembryo the terminal cell gives rise to the 

 entire embryo and the second cell to the mass of the suspensor. 



14. The early stages in the development of the embryo are of the 

 Capsella type. The dermatogen, however, appears at a later stage. 



15. There is no hypophysis. 



16. The embryo sac is nourished by means of a nutritive jacket de- 

 rived from the inner integument. 



17. The food material which enters the ovule through the funiculus 

 is partly deposited in the surrounding tissues and partly passed on to 

 the chalazal region of the embryo sac. 



18. A mass of endosperm in the chalazal region of the embryo sac 

 acts as an haustorium in the later stages and digests the surrounding 

 tissue. 



