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. 



