IlfTENSITE SEaREGATIOlSr. 319 



eessive generations will be increasing degrees of Segregation and 

 of divergence, is what I call the law o^ Intensive Segregation. The 

 different forms of this principle, resting on the certainty that the 

 cooperation of any one of the principles of transformation witli any 

 one of the principles of independent generation will produce 

 increasing Segregation with increasing divergence, are the fol- 

 lowing : — 



1. Assimilational Intension, or Segregation and Divergence 

 through Independent Assimilation. 



2. Stiimdational Intension, or Segregation and Divergence 

 through Independent Stimulation. 



3. Suetudinal Intension, or Segregation and Divergence through 

 Independent Suetude. 



4. Emotional Intension, or Segregation and Divergence through 

 Independent Emotional Transformation. 



5. Selectional Intension, or Segregation and Divergence through 

 Independent Selection. 



6. Eliminational Intension, or Segregation and Divergence 

 through Independent and indiscriminate Elimination. 



7. Amalgamational Intension, or Segregation and Divergence 

 through Independent Amalgamation. 



8. Fecundal Intension, or Segregation and Divergence through 

 Independent Eecundal Transformation. 



In groups that do not intergenerate, divergent forces reveal 

 themselves whenever transformation is introduced. If it were 

 possible to believe that in any case the effects of Independent 

 Selection or of Independent Suetude had been completely 

 parallel, it would still be impossible to believe that both of these, 

 together with tlie remaining sis principles of transformation, 

 would ever so combine as to produce completely parallel effects. 

 It is a familiar fact that no two persons ai-e exactly alike ; and 

 it is probably true that no two groups of any organism are exactly 

 alike. Though we cannot fully explain the fact we accept as a 

 certainty the non-equivalence of hiological quantities : and con- 

 sequently we assume with confidence that there cannot be com- 

 pletely parallel transformation in isolated sections of a species, 

 even if all are surrounded by the same environment. This 

 principle is not inconsistent with the production of what Prof. 

 Hyatt calls " representative or pai'allel characteristics " in two or 

 more divergent series of forms. What he points out is that, 

 under the influence of heredity, similar organisms exposed to 



