WHAT IS PHYSICAL LIFE 



people know of no certainty. When in 

 addition he hears little else than a confus- 

 ing din of controversy among biologists 

 about their theories, he may then think 

 that this once awesome divinity of Science 

 is after all not unlike Dickens' portentous 

 Mrs. Harris. 



But nothing could be more untrue, and 

 therefore unjust. Neither men of science 

 nor any one else have reason to doubt that 

 all phenomena in Nature, including those 

 of physical life, are due to natural causes, 

 which science, therefore, has every right to 

 investigate. Thus if something beyond 

 Nature's powers is to be found anywhere 

 it would be in the mysterious processes of 

 cell growth in an animal body. There 

 every different cell finds its own exactly 

 proper place, a brain cell in the brain, a 

 secreting cell in a gland and never in a 

 muscle, and so on in beautiful adjustments 

 without number, as if "some great intelli- 

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