CELL-NUCLEUSFERTILISATION 249 



our attention on the manifold variety ex- 

 hibited by plants, the adaptedness of species 

 to their environment is always one of the 

 most striking of their many qualities. But, 

 as we have seen, this adaptedness is intrinsic- 

 ally the result of the inner constitution of 

 the plant, which impels it of necessity to 

 develop in this or that particular manner. 

 Only those plants whose constitutions are such 

 as to cause their development to be adapted 

 to a given environment can flourish under the 

 particular conditions imposed by it. 



Adaptedness is often achieved in an indirect 

 fashion, but it must be susceptible of realisa- 

 tion in some way or another if the individual 

 is to survive. 



Every species, just as every individual of 

 the species, has to face its critical problems. 

 And the problems of the species are really 

 the same, though sometimes disguised under 

 different forms, as those which confront the 

 individual. The race problems are solved by 

 the individuals, often in a wonderful way. 

 Thus many tolerably heavy fruits are dis- 

 persed by a wing-like outgrowth which delays 

 their descent to the ground. But at an 

 earlier stage this wing-like outgrowth is 

 generally green, and so may well have helped 

 in the nutritive processes. We can state with 

 confidence that it was not developed in order 

 to aid in the dispersal of the fruit, but that it 

 arose as the result of far backward-reaching 

 correlations of ultimate structure and chemical 



