THE NH 2 GROUP 321 



amount required to do so is so small that the kreatin 

 and xanthin which it contains will not account for the 

 divisions it induces. These bodies are amido-acids, and 

 we think that the NH 2 group of the molecules may be 

 responsible for the auxetic action. In this respect it 

 is interesting to note that alkaloids, which augment the 

 action of auxetics, are compound ammonias; but it 

 must be remembered that we have never yet been able 

 to induce a division with an alkaloid by itself, although 

 we have tried literally hundreds of times. 



In the next chapter we shall show that there is 

 another great and very important source of the " causes 

 of the cell-proliferation of healing" contained in a 

 substance we call "globin," a histone derived from 

 haemoglobin. 



