INTENSIVE SEGREGATION. 



329 



Natural Selection.— As Natural Selection involves not only 

 the superior propagation of the better fitted, bnt the inferior 

 propagation of tlie less fitted, and the non-propagation of the 

 least fitted, it may be described as the ExcUsive propac/ation of 

 those letter fitted to the natural envirojiment, through the 

 failure to propagate of the less fitted. Transformation by means 

 of Natural Selection depends on varying degrees of adaptation 

 to the environment in creatures that are intergenerating, the 

 higher degrees being possessed by other than average forms. 

 Divergence is produced by Natural Selection only when to the 

 above conditions producing transformation are added causes tliat 

 nrevent intercrossing between the sections that are being inde- 



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