WHAT IS PHYSICAL LIFE 



inheritance of acquired characters, and if 

 such are not inherited, the whole theory 

 faUs. 



Meanwhile, an increasing number of 

 biologists, such as von Nageli and the late 

 Professor Eimer, along with the American 

 paleontologists, Cope, Osborn, Whitman, 

 and a number of others, have become so 

 convinced of the inadequacy of either the 

 Darwinian or the Lamarckian theories to 

 explain everything that they are sure of 

 the existence of some other important 

 factors in the processes of evolution, 

 though these have not yet been demon- 

 strated. They find development often 

 following lines which seem predetermined 

 for it to follow before either natural selec- 

 tion or use could have exerted any influ- 

 ence. The facts on which this doctrine of 

 predetermination, or orthogenesis as it is 

 called, are based, are very numerous and 

 are wholly inexplicable on any hypothesis 

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