136 INJURY, RECOVERY, AND DEATH 



in Fig. 56. For the sake of simplicity they are represented 

 as having been obtained by the use of one pair of salts, 

 which are designated as A and B. The curve CDE, there- 

 fore, represents diagrammatically the growth of roots 



H 



A 100 



75 



50 



% 



B 



25 



75 



100 



Fia. 56. 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 growth in a mixture of A 0.1 M and 

 B 0.12 M in such proportions that 75% of the dissolved molecules are A and 25% are B; on 

 the curve which lies immediately above CDE the ordinate at G represents growth in a 

 mixture of A 0.05 M and B 0.06 M in such proportions that 75% of the dissolved molecules 



are A and 25% are B. 



in mixtures of equally toxic solutions of two salts, A and 

 B. The abscissas represent molecular proportions ; thus 

 the point G represents a mixture in which the dissolved 

 molecules are 75% A and 25% B ; the point H a mixture 

 in which the dissolved molecules are 50% A and 50% B. 



