70 WHAT IS LIFE 



templation 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 develop- 

 ment 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. 



