28 EXCITORS OF CELL-DIVISION 



The next two substances are auxetics by them- 

 selves, viz. : 



Artificial : tetra-ethyl ammonium 



hydroxide . . (3 c.c., 1 per cent) 



,, meta-phenylene diamine ( ,, ,, ) 



and, 



Artificial: betain. . . . (1 c.c., 1 percent) 

 tetra-methyl ammonium 



hydroxide . . (0*3 c.c. ) 



are also auxetics if atropine is absorbed by the 

 cells as well. 



Kinetics. At the time of writing the former 

 publication, the known kinetics were : 



Artificial : atropine . . . (0*7 c.c., 1 per cent) 



quinine . . . (1 c.c. ) 



cocaine . . . (2 c.c. ) 



pilocarpine . . (0'5 c.c. ) 



strychnine . (1 c.c. ,, ) 



brucine . ( ) 



codeine . . . (0'3 c.c. ) 



morphine . . . (0'2 c.c. ,, ) 



pyridine . . . (O'l c.c. ) 



quinoline . . . (1 c.c. ) 



Natural 1 : choline . ( ) 



cadaverine . . ( ) 



neurine . . . (0'5 c.c. ) 



Others have since been tried, and the following 

 are effective excitors of amoeboid movements : 



