DEVELOPMENT OF REFLEX MECHANISMS 85 
tional mechanisms of the brain cannot profitably be investigated 
without a precise knowledge in each stage investigated of the pe- 
ripheral relations of each of these functional systems and of the 
interrelations of the neurones involved at every step in the prog- 
ress of the nervous impulse from periphery to center and back 
to the effector organs during the normal course of functional 
activity. 
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