Appendix 



of sonie other organ. The period or place of 

 the first appearance of an organ can be deter- 

 mined fairly accurately. Concerning its period 

 of most rapid development there is room for 

 much difference of opinion. Here the chart loses 

 in accuracy what it gains in definiteness. Only 

 substantial and general correctness can be claimed 

 for Charts V and VI. 



Chart VI is largely physiological, showing the 

 rise of functions to dominance or supremacy in 

 the animal body. 



Chart VII accompanies Chapter V. It shows 

 the principal competitors at each period of geo- 

 logical history, and their descent from the ap- 

 parently defeated form of the preceding period. 



