REPRODUCTION 111 



in simple terms, the inadequacy of some of 

 the working hypotheses that have been our 

 guides." 



The facts of development and the observa- 

 tions which are due to the labours of the 

 experimental embryologists present us with a 

 picture wholly different from that afforded by 

 a contemplation of the processes of inanimate 

 bodies and it is the contemplation of this wide 

 and unbridgable difference which seems to be 

 leading those or many of those whose work is 

 chiefly of an embryological character to the 

 conclusion that some kind of force other than 

 that recognised by chemists and physicists 

 must have its existence in the living cell, a 

 force which is able to direct it to its appointed 

 term of development and even, as we have 

 seen, to lead it there in spite of difficulties 

 which it could never have been supposed a few 

 years ago by any scientific man would have 

 been placed in its way. 



