168 ARCHEGONIATES. 
If the results of the several observers referred to in the preceding 
paragraphs be correct, the behavior of the fusion nucleus in Przus 
differs not only from that of Cycas and Gizkgo as described by Ikeno, 
but also from the fusion nucleus in all other plants, a case described 
in a species of Spzrogyra by Chmielewskij excepted. 
The fate of the other male nucleus, together with that of the stalk 
cell and tube, indicates that these structures are consumed as nutrient 
material. Whether the cytoplasm which is brought into the egg with 
the male nucleus or as a part of the spermatozoid has any morpho- 
logical or hereditary value must still remain an open question. 
From the standpoint of this work the development and union of the 
sexual elements in the Gnetales are so imperfectly known that a dis- 
cussion of the subject will not be given. The process of fecundation 
in Gnetum gnemon has been described in considerable detail by Lotsy 
(99), to whose paper the reader is referred. 
