250 IV. THE PRINCIPLES OF LIFE PHENOMENA 



great influence upon the character of amoeba. Danielli (43), using- 

 two large species of amoeba, /. e., Amoeba proteus and A discoides, 

 has carried out transplantation of the nuclei of individuals of one 

 species to those of the other species from which their own nucleus had 

 been previously eliminated and found that the form of the amoeba and 

 the diameter of the nucleus are mainly determined by the cytoplasm, 

 although the nucleus, of course, has some influence and in the long 

 run it comes to exert a more pronounced influence, most of the amoe- 

 bae becoming to have an intermediate form between discoid and 

 proteus. 



