Siunmary and Conclusion. 



1. In Hamamelis the anthers are bilocular from the bo- 

 ginning. 



2. The generative cell in the pollen r^rain h^.s a coll 

 wall developed which is afterward dissolved. 



3. The pollen tube when grown artificially shows a 

 marked tendency to form cellulose plugs, and also 

 forms spheres into which the contents of the tube 

 are withdrawn. Thus far these phenomena have not 

 been observed in normal growth. 



4. The development of the pollen tube in the style maybe 

 divided into three periods: P'irst period of growth, 

 Hibernation, and second period of growth. Touring 

 Hibernation the walls are thickened, and the diam- 

 eter of the t-.ibe enlarged, a smaller size and thin- 

 ner walls appearing in t}. e next stage. 



5. There ar-e several macrospores developed, only one 



