80 Evolution of Intelligence 



energy within the system is built up was the 

 subject matter of a previous chapter. 



The table for longevity was made up from 

 large families. The parents of large families are 

 well along in life when their later children are 

 produced, and the strenuous efforts in caring for 

 earlier ones built up their powers before the 

 later ones were conceived. The later children 

 live longer than the earlier ones because they 

 inherit the powers which their parents acquire in 

 the years between the production of the earlier 

 children and the later ones. 



Does some one think that adding to the longev- 

 ity of children by causing the parents to devel- 

 op their own powers by exercise before produc- 

 ing the children is a freak idea which has no 

 foundation in fact ? We can determine that mat- 

 ter positively by going to the records of the 

 trotting horse. 



We have a record of 39 stallions of the trot- 

 ting breed who lived to be 30 or more years of 

 age. These horses were all born between the 

 years of 1804 and 1887. During that period of 

 horse history, not one stallion in a hundred was 

 trained and raced sufficiently to enable him to 



