196 Regulation of Size in Unicellular Organisms 



urn"; yet regulations go on which are of the same sorts 

 as are performed by huge organisms whose master 

 cells and organs never experience gross inconstancies 

 of the environment. 



Co-ordination of constituent functions. Individual- 

 ity seems to be less a self-sufficiency than a co-ordina- 

 tion. It is unessential to the problem that two individ- 

 uals can be obtained by cutting one into halves, or 

 that two individuals form from one, at a certain time 

 under certain conditions. The biologist's goal is to 

 describe what functions go to constitute the simultane- 

 ous complex of activities which is the individual. 

 When these functions and their correlation have been 

 described, individuality will have been defined. The 

 regulation of each function, such as that of size, will 

 be both part and whole of the co-ordination. 



