THE FERTILIZATION OF THE OVUM. 35 



elusion, what has been said several times already, that I con- 

 sider both cytoplasm and nucleus essential constituents of the 

 cell, and therefore one cannot be said to be more important 

 than the other. In all the phenomena of cell life, growth, 

 regeneration, fertilization, division, the building of the organ- 

 ism, the transmission of heritable characters, both nucleus 

 and cytoplasm take part, though probably not always an equal 

 part. The entire cell is still the ultimate independent unit of 

 organic structure and function. 



