248 THE CYCLE OF CELL-DIVISION 



with the cell-proliferation of healing ? Lymphocytes 

 proliferate in healing, especially in chronic healing, and 

 chronic healing is a forerunner of cancer. Still 

 leucocytes proliferate even more than lymphocytes in 

 healing, but we had never up to this point, nor had 

 any one else, ever seen a leucocyte divide. If the agent 

 in the azur dye was analogous to a chemical substance 

 in the body which caused the cell-proliferation of 

 healing, it ought, strictly speaking, to cause the multi- 

 plication of polymorphonuclear leucocytes as well as 

 lymphocytes. But so far it had not done so. 



All these points were carefully considered at this 

 stage, and they urged us to make further researches. 

 Whether we were right or wrong in supposing that 

 there might be a chemical auxetic in the body which 

 caused proliferation of cells in a manner similar to 

 the agent contained in the azur .dye, we had made 

 one step in causing one class of human cells to divide 

 on the microscope stage by means of a chemical agent. 



