THEORIES AND CONCLUSIONS 



and the many complicated outside forces or 

 environments. To guide the interaction of 

 these two forces, both of which are only 

 different expressions of the one eternal 

 force, is, and must be, the sole object of the 

 breeder, whether of plants or animals." 



He speaks of a vital Principle. He does 

 not attempt to establish its essence or 

 identity, but he says: 



" When simple cells become joined together, 

 mutual protection is assured, and we know 

 that they exhibit organized forces in new 

 directions which were impossible by any 

 of the individual cells not associated in a 

 cell-colony with its fellows. These cell- 

 colonies will, if environment is favorable, 

 increase in strength, while colonies less favor- 

 ably situated may be crippled or destroyed. 

 We see this natural selection in all life, every 

 day all around us. But this is only one of 

 the many forces at work in the upward, 

 outward and onward movement of life." 



Other men who have gone deeply into 

 the inner life of Nature have given the 

 world elaborate systems by which to account 

 for and interpret many of the acts of Nature. 



347 



