No. 449.] STUDIES ON THE PLANT CELL. 369 



2. Non-Protoplasmic Contents. 



(a) Food material and waste products. 



(b) Vacuoles. 



3. The Cell Wall. 



Section II. The Activities of the Plant Cell. 



1. Vegetative Activities. 



2. Cell Division. 



(a) The Events of Nuclear Division. 



1. Direct Division. 



2. Indirect Division (Mitosis). 



Prophase, Metaphase, Anaphase, Telophase. 



3. The Dynamics of Nuclear Division. 



(b) The Segmentation of Protoplasm. 



1. Cleavage by Constriction. 



2. Cleavage by Cell Plates. 



3. Free Cell Formation. 



Section III. Highly Specialized Plant Cells and Their 

 Peculiarities. 



I. The Zo5spore. 2. The Sperm. 3. The Egg. 4. The 

 Spore Mother Cell. 5. The Coenocyte. 6. The Coeno- 

 gamete. 



Section IV. Cell Unions and Nuclear Fusions in Plants. 



Section V. Cell Activities at Critical Periods of Ontog- 

 eny in Plants. 271:saL3Ua^Ji:J* 



I. Gametogenesis. 3. Sporogenesis. t^. Reduction of 

 Chromosomes. ^. Apogamy. /^. Apospory. ^. //yo-il«ty»-£iti 



Section VI. Comparative Morphology and Physiology of 

 the Plant Cell. 



