36 THE START [chap, i 



intelligence ; and during their species-life they have 

 witnessed the death of countless other species of far 

 greater intelligence, but in other ways less adapted to 

 succeed in the euAaronmental complex. The same state- 

 ment can be made of all the many, many other known 

 factors in development, from fecundity to concealing 

 coloration ; and behind them lie forces as to which we 

 veil our ignorance by the use of high-sounding nomen- 

 clature — as when we use such a convenient but far from 

 satisfactory term as " orthogenesis." 



