1918] OTTLEY—IMPATIENS 311 
Instead of describing the seed as having no endosperm, he would 
say that there is a small amount of endosperm present. 
Summary 
1. The ovule possesses but one hypodermal archesporial cell. 
2. The archesporial cell is also the megaspore mother cell. 
3. An axial row of two cells is formed. The chalazal cell is the 
mother of the embryo sac. 
4. A normal 8-nucleate sac is formed. 
5. There isa variation in the position af the synergid nuclei, due 
to their age. 
6. The two polar nuclei come in contact directly beneath the 
egg and do not fuse until after the pollen tube has entered the 
embryo sac. 
7. The 3 antipodals may be either 3 cells or a group of 3 nuclei 
cut off from the upper region of the sac by a membrane. 
8. The antipodals disappear soon after the egg apparatus is 
formed. 
9g. The megaspore mother cell and the early 2-nucleate embryo 
sac are bounded at the apex and sides by the nucellar epidermis. 
10. The embryo sac absorbs the nucellar epidermis and by 
means of an antipodal haustorium absorbs all of the nucellus 
between the sac and the chalaza. 
11. The tapetum is derived from the inner layer of the inner 
integument. 
12. The outer integument arises from the inner integument. 
13. Binucleate tapetal cells surround the microspore mother 
cells. They also extend into the mass of sporogenous cells and 
separate the functional mother cells into groups. 
14. The nucleus of the generative cell of the pollen grain appar- 
ently does not divide before pollination. 
15. The pollen tube enters the embryo sac along the side of the 
filiform apparatus and extends down one side ‘of the embryo sac 
until it is near the egg nucleus. 
16. Two coiled sperm nuclei are often seen near the egg 
nucleus. 
17. It seems very probable that triple fusion occurs. 
