PAKT III. 



THE PSYCHIC DEVELOPMENT OF YOUNG 

 ANIMALS AND ITS PHYSICAL COR- 

 RELATION. 



I. THE DOG. 

 Introduction. 



FOR mind and body alike the past determines the 

 present in no small degree ; hence it follows that the 

 more perfectly the history of each step in the develop- 

 ment of mind is traced, the better will the final product, 

 the mature, or relatively fully-developed mind, be 

 understood. Anatomical researches were long con- 

 ducted on the bodies of animals before the light thrown 

 on structure by embryology cleared up the obscurities 

 which of necessity hung about parts, the origin and 

 early development of which were unknown. 



Comparative anatomy had already done something 

 to give increased significance to anatomy as a whole, 

 but it was only by tracing the animal body back to its 

 primitive germ cells, following these cells in their 

 development into tissues and organs by the naked eye 

 and with the microscope, comparing these changes in 

 one animal with corresponding ones in another, and 

 indeed in plants, and interpreting them all in the light 

 of evolution, that the present status of biojogy has been 

 reached. 



Psychology is as yet in no such position ; but it 



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