PROTOPLASM. THE INDIVIDUAL 41 



To these we shall have to add two others, namely, 



Environment produces Continuity, and 

 Continuity produces Arrest, 



in order to throw light on the principles of Growth in living 

 organisms, and the method of their evolution in the 

 ascending scale. 



We shall now take one by one the main forms of living 

 Continuity in the ascending scale, beginning with the 

 Discontinuously Multicellular. It must be noted that the 

 illustrative examples given are offered as types of Continuity, 

 and that in no case is a given organism put forward as an 

 actual milepost on Evolution's main road, except in regard 

 to its Continuity. The question of how the different types 

 of Continuity probably evolved will be dealt with later in 

 the chapters on Evolution. 



