THE STRUGGLE FOR THE LIFE OF OTHERS 337 



there are three great marks or necessities of all 

 true development — Aggregation, or the massing of 

 things ; Differentiation, or the varying of things ; 

 and Integration, or the re-uniting of things into 

 higher wholes. All these processes are brought 

 about by sex more perfectly than by any other 

 factor known. From a careful study of this one 

 phenomenon, science could almost decide that 

 Progress was the object of Nature, and that Al- 

 truism was the object of Progress. 



This vital relation between Altruism in its early 

 stages and physiological ends, neither implies that 

 it is to be limited by these ends nor defined in 

 terms of them. Everything must begin somewhere. 

 And there is no aphorism which the labours of 

 Evolution, at each fresh beginning, have tended 

 more consistently to endorse than " first that which 

 is natural, then that which is spiritual." How this 

 great saying also disposes of the difficulty, which 

 appears and reappears with every forward step in 

 Evolution, as to the qualitative terms in which 

 higher developments are to be judged, is plain. 

 Because the spiritual to our vision emerges from 

 the natural, or, to speak more accurately, is con- 

 voyed upwards by the natural for the first stretches 

 of its ascent, it is not necessarily contained in that 

 natural, nor is it to be defined in terms of it. 



