REPRODUCTION. 7 



divided at regular intervals into smaller individuals, 

 perhaps even at last into single cells, but from which 

 there are periodically given off cells that develop as 

 germ cells into new multicellular individuals. 



B. Another phenomenon which appears in the 

 primordial plasma or its immediate offspring is the 

 death of the greater part of the plasma under cer- 

 tain unfavorable conditions of nutrition, while the 

 smaller part continues to be nourished at its expense 

 and in that case remains viable during the dormant 

 period. 



In the offspring this phenomenon gradually 

 becomes free cell formation, which takes place 

 before the resting stage or before the death of 

 many unicellular and multicellular organisms, and 

 which forms germ cells from a part of the con- 

 tents of the parent cells. 



The formation of germ cells by cell division (A), 

 or by free cell formation (B) is reproduction of the 

 organism. The germ cells are the elements in which 

 the life and growth of the parental individual are 

 continued. 



5. MORPHOLOGY OF THE IDIOPLASM IN GENERAL. 



The larger part of the unarranged, soft and homog- 

 enous primordial plasma, which grows by intus- 

 susception, becomes watery soma-plasm, with 

 unarranged and easily movable micellae. The 

 smaller part is converted in the course of phylogeny 



