258 THE REIGN OF LAW. 



the infinite complications of the organic world. 

 It is unquestionably the basis of many of the 

 Correlations of Growth prevailing in Plants and 

 Animals. It is seen in the symmetrical arrange- 

 ment of all vegetable, and of all animal Forms. 

 A central axis is traceable in them all ; and the 

 Bilateral, or Radiated arrangement of their subor- 

 dinate parts is one of the most fundamental and 

 universal of all the Correlations of Growth. 



This is one, but it is one only, of the Correla- 

 tions of Growth which are constantly observed. 

 It would lead us to expect that any change of 

 form on one side of an animal would be accom- 

 panied by an exactly corresponding change on 

 the other side; so that limbs on one side of the 

 central axis, if changed at all, would change in 

 exact and symmetrical accordance with the limbs 

 on the opposite and corresponding side. This, 

 accordingly, is one of the Correlations of Growth 

 most constantly observed. 



Now it will be seen that Correlation of Growth 

 in this first and simplest sense, runs alongside, as 

 it were, of Correlation in another and higher sense. 

 The relation between two equal and opposite 



