20 BIOLOGICAL LECTURES. 



out of which all the higher members are built. But while giving 

 due weight to this suggestive hypothesis, we may question 

 whether its acceptance does not introduce as many new special 

 difficulties as those which it sets aside ; while we must admit 

 that it leaves untouched the fundamental problem of division. 

 The solution of this problem may perhaps have to be sought in 

 a quite different direction from the pangen hypothesis. Whether 

 we shall succeed in finding it is another question. 



