WHAT IS PHYSICAL LIFE 



no more. But so soon as we find that the 

 trend is towards a scientific demonstra- 

 tion of the origin of Man himself, our 

 mental attitude immediately changes. It 

 is now we ourselves who are personally 

 involved in the discussion, and none the 

 less so because we are not to consider man 

 from a metaphysical or philosophical or 

 theological standpoint, but only as science 

 must regard him. 



But even then we feel that nothing 

 which we have already passed quite pre- 

 pares us for this task, because not only 

 lofty heights, but also profound depths 

 lie before us, if Man is to be accounted for. 

 He is the problem of problems, every 

 proposed explanation of which proves to 

 be very incomplete. It is all very well 

 to follow life unicellular to life multicellu- 

 lar, and then from forms now living to 

 those long extinct, whose remains in the 

 earth's rocky cemeteries show how all came 

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