50 The way of experience the one 



is ours too. We find then no ground for 

 separating organic life from psychical life: 

 for us all life is experience. We cannot 

 therefore assume that experience has no 

 part in the building up of the organism, 

 and only begins when a viable organism is 

 already there. For us, ontogeny a,nd here- 

 dity are aspects of a single process — a 

 process that only experience will explain. 



Again, the principle of continuity forbids 

 us to assume that this process, by which 

 an organism is built up, abruptly changes 

 when we pass from unicellular organisms to 

 multicellular. The way of trial and error 

 and eventual success — function determining 

 structure — followed in the earlier stages of 

 the progress of life — in phylogeny, as it is 

 technically termed — has equally been the way 

 of its progress ever since. Every organism 

 has proceeded from an organism ; yet among 



