MISSING FACTOR IN CURRENT THEORIES 19 



either with Nutrition or with Reproduction. Just 

 as everything about an engine, every bolt, bar, 

 valve, crank, lever, wheel, has something to do 

 with the work of that engine, everything about an 

 animal's body has something to do with the work 

 prescribed by those two functions. An animal, or 

 a Man, is a consistent whole, a rational production. 

 Now the rationale of living stands revealed to us in 

 protoplasm. Protoplasm sets life its task. Living 

 can only be done along its lines. There start the 

 channels in which all life must run, and though 

 the channels bifurcate endlessly as time goes on, 

 and though more life and fuller is ever coursing 

 through them, it can never overflow the banks 

 appointed from the beginning. 



But this is not all. The activities even of the 

 higher life, though not qualitatively limited by the 

 lower, are determined by these same lines. Were 

 these facts only relevant in the domain of physi- 

 ology, they would be of small account in a study 

 of the Ascent of Man. But the more profoundly 

 the Evolution of Man is investigated the more 

 clearly is it seen that the whole course of his 

 development has been conducted on this funda- 

 mental basis. Life, all life, higher or lower, is an 

 organic unity. Nature may vary her effects, may 

 introduce qualitative changes so stupendous as to 



