376 PHYSIOLOGICAL DEVELOPMENT. 



going paragraphs suggest how this necessary correlation is 

 brought about For a great part of the physiological union 

 that accompanies the physiological specialization, there 

 appears to ba a sufficient cause in the process of direct equili- 

 bration ; and indirect equilibration may be fairly presumed a 

 buffioieut ctt.ose for that which remains. 



