PLATE XI. 



FIG. 113. A peculiar figure sometimes observed in the late telophase of the 

 division. X 744- Pinus austriaca. June 10, 1898. 



114. A pollen-tube in which the smaller sperm-nucleus appears to be in ad- 

 vance of the larger. This pollen-tube, having approached an egg 

 that had already been fertilized, has turned aside and is passing up 

 over the endosperm so that the normal position of the cells appears 

 exactly reversed; n.c., neck-cells of the archegonium. X 289- Pinus 

 Strobus. June 20, 1898. 



115-116. Cross-sections through the two sperm-nuclei after they have 

 attained full size and have about reached, in their downward passage, 

 the middle of the nucellar cap. X 744- Pinus Strobus. June 15, 1898. 



117. The sperm-cell after all traces of the spindle have disappeared, but 

 before the two nuclei have come together. X 472. Pinus Strobus. 

 June 13, 1898. 



118. The same after both nuclei have come to lie in the upper part of the 

 cell. X 472. Pinus Strobus. June 10, 1898. 



(176) 



