THE RATE OF GROWTH 



127 



600% 



500% 



with great energy, full of vigour ; 

 rapidly ; and as the la- 

 bour continues fatigue 

 comes into play. More- 

 over, the wall grows 

 higher, and it takes 

 more effort and time to 

 carry the material up to 

 its top, and to continue 

 to raise its height, and 

 so, as the wall grows 

 higher and higher, it 

 grows more slowly and 

 ever more slowly, be- 

 cause the obstacles to 

 be overcome have in- 

 creased with the very 

 height of the wall itself. 

 So it seems with the in- 

 crease of the organism ; 

 with the increase of our 

 development, the ob- 

 stacles to our growth 

 increase. How that is I 

 shall hope to explain to 

 you a little more clearly 

 in the next lecture. 



We have one more 

 slide, which I would 

 like to show you. It indicates the 



the wail goes up 



34 5 6 7 8 9 10 



FIG. 45. 



rate of growth in 



