126 SOME RECENT RESEARCHES IN PLANT PHYSIOLOGY 



FIG. 11. EFFECT OF DILUTION ON THE FORMS OF ANTAGONISM CURVES. 



The ordinates represent the growth of roots in solutions, the composition 

 of which is represented by the abscissae. For example, on the curve 

 CDE the ordinate at G represents the growth in a mixture of A 0-1 M 

 and B 0'12 M in such proportions that 75 per cent, of the dissolved 

 molecules are A, and 25 per cent, are B. In the curve immediately 

 above CDE the ordinate at represents the growth in a mixture 

 of A 0*05 M and B 0*06 M in the proportions denoted by the 

 point 0. 



such as Fig. 10. In it the dotted line denotes the additive 

 effect. Antagonism may be measured as usual ; for example, 



at the point M it is ^pvr 



JVLN 



