way tlirougliout all life 51 



unicellular organisms though there has been 

 progress there has been no genealogy. Among 

 multicellular organisms we find both: while 

 the offspring is still unicellular at the start, 

 the parents from which it sprang are uni- 

 cellular no more. The greater this difference 

 in complexity between the offspring and its 

 parents, the longer the way its common an- 

 cestors will have traversed phylogenetically 

 or historically, and the longer too the way 

 that it will have to traverse ontogenetically 

 or automatically, before attaining to the 

 parental level and beginning a pergonal 

 history of its own. 



This pre-natal, so to say, prehistoric life, 

 is called a heritage. And why? Because, 

 looking broadly at the whole record of mul- 

 ticellular genealogies, there appears to be 

 everywhere more or less correspondence and 

 nowhere a positive deviation between the two 



