PAR DLL 
THE PSYCHIC DEVELOPMENT OF YOUNG 
ANIMALS AND ITS PHYSICAL COR- 
RELATION. 
I —THE Doe. 
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 hght 
of evolution, that the present status of biology has been 
reached. 
Psychology is as yet in no such position; but it 
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