CHANGING IDENTITIES 



There is then in the changes going on in the 

 stomach, nerve, brain and muscle, and wherever a 

 new living identity is formed a total breaking up 

 of old identities. 



PROPOSITION XIX. 



Heat is necessary in the reproduction of every 

 living identity. 



Because we know no substance which could not 

 be made colder; therefore, we can observe very 

 little about things at absolute zero. 



But we know grass- cannot grow at zero, neither 

 can a chicken be hatched from an egg in a freezing 

 mixture. 



Wherever we see the process of growth, and 

 growth is reproduction and birth, we see these 

 processes taking place in a suitable temperature. 

 And when that suitable temperature is lacking, one 

 form of life after another disappears. 



It is then apparent from world-wide experience 

 that life, which is constantly depending on the 

 destruction of old identity and the building up of 

 new identities, is possible only at certain tem- 

 peratures. And every form of life has its own 

 range of temperature wherein only it may exist, 

 and that range is very limited. What, then, is the 

 reason for this well known fact ? 



Let it be granted that the hypothesis of Prop. 

 XVII, B. 2, is correct. Then in order that twelve 



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