332 THE PLAY OF ANIMALS. 



5. Organic Selection (Baldwin) : the perpetuation 

 and development of (congenital) coincident variations 

 in consequence of accommodation. 



6. Orthoplasy (Baldwin) : the directive or determin- 

 ing influence of organic selection in evolution.* 



7. Orthoplastic Influences (Baldwin) : all agencies 

 of accommodation (e. g., organic plasticity, imitation, 

 intelligence, etc.), considered as directing the course of 

 evolution through organic selection. 



8. Tradition (Lloyd Morgan) : the handing on from 

 generation to generation (independently of physical he- 

 redity) of acquired habits. 



9. Social Heredity (Baldwin) : the process by which 

 the individuals of each generation acquire the matter of 

 tradition and grow into the habits and usages of their 

 kind.f 



J. Mark Baldwin. 



* Eimer's " orthogenesis " might be adopted were it possible to 

 free it from association with his hypotheses of " orthogenic " or 

 1 determinate " variation, and use-inheritance. The view which I 

 wish to characterize is in some degree a substitute for these hy- 

 potheses. 



f For further justification of the terms " Social Heredity " and 

 "Organic Selection," I may refer to the American Naturalist, 

 July, 1896, pp. 552 ff. 



