3 68 



BOTANICAL GAZETTE 



[OCTOBER 



c 



A^OOJA^ + g 



A 100 



75 



50 



25 







o 



% 



B 







25 



50 



75 



100 % 



Fig. i. — Effect of dilution on the forms of antagonism curves: the ordinates repre- 



growth of roots in solutions, the composition 



epresented by the 



abscissas; for example, on the curve CDE the ordinate at G represents growth in a 



mixture 



immedi 



mixture 



such proportions that 75 per cent of the dissolved molecules are A and 25 per cent 



are B. 



